Ek. 7. (A, B) Supply "the" or 1. Because of the greenhouse effect" climate of the world is changing.
2. We can't be sure about the history of human race, but man developed
earlier than we think, though we certainly weren't around at the time of dinosaurs.
3. The Ancient Greeks believed in gods. The idea of God was not known to them.
Mr Stocks has shown that Egyptians used saws and drills.
saws and drills were made of copper.
5. My eldest son joined Navy and now my youngest wants to join Army.
6. In many countries the head of state is called President.
7.
Do you know who killed
President Lincoln?​

I. Past Simple or Past Continuous:
1. The correct answer is c) were walking, started.
Explanation: The first action "walk" is in the past continuous tense because it describes an ongoing action that was happening at a specific time in the past. The second action "start" is in the past simple tense because it describes an action that happened after the first action and interrupted it.

2. The correct answer is b) rang, was having.
Explanation: The first action "ring" is in the past simple tense because it happened at a specific time in the past. The second action "have" is in the past continuous tense because it describes an ongoing action that was happening at that time in the past.

3. The correct answer is b) were waiting, arrived.
Explanation: The first action "wait" is in the past continuous tense because it describes an ongoing action that was happening at a specific time in the past. The second action "arrive" is in the past simple tense because it happened after the first action.

4. The correct answer is c) were you doing; was dancing; was singing.
Explanation: The question is asking about ongoing actions in the past. The first action "do" is in the past continuous tense because it describes an ongoing action that was happening at that time. The second action "dance" and the third action "sing" are also in the past continuous tense because they were happening at the same time as the first action.

5. The correct answer is b) were watching, was washing.
Explanation: The first action "watch" is in the past continuous tense because it describes an ongoing action that was happening at a specific time in the past. The second action "wash" is in the past continuous tense because it happened at the same time as the first action.

II. Past Simple or Past Perfect:
1. The correct answer is b) hadn't cleaned, had come.
Explanation: The first action "clean" is in the past perfect tense because it happened before the second action "come." The second action "come" is in the past simple tense because it happened after the first action.

2. The correct answer is a) had written, went.
Explanation: The first action "write" is in the past perfect tense because it happened before the second action "go." The second action "go" is in the past simple tense because it happened after the first action.

3. The correct answer is c) were, had left.
Explanation: The first action "be" is in the past simple tense because it describes a state in the past. The second action "leave" is in the past perfect tense because it happened before the first action.

4. The correct answer is c) phoned, had gone.
Explanation: The first action "phone" is in the past simple tense because it happened at a specific time in the past. The second action "go" is in the past perfect tense because it happened after the first action.

5. The correct answer is b) came, had done.
Explanation: The first action "come" is in the past simple tense because it happened at a specific time in the past. The second action "do" is in the past perfect tense because it happened before the first action.

III. Past Simple/Past Continuous/Past Perfect:
1. Alice closed the magazine, rose from the sofa, and went to the kitchen.
Explanation: The actions described here are in the past simple tense because they happened at specific times in the past.

2. The question doesn't provide enough information to determine the correct answer.

3. The correct answer is hadn't sent.
Explanation: The action "send" is in the past perfect tense because it happened before the boss came to work.

4. The correct answer is were cleaning, came.
Explanation: The first action "clean" is in the past continuous tense because it describes an ongoing action that was happening at a specific time in the past. The second action "come" is in the past simple tense because it happened after the first action.

5. The correct answer is was watching, washed.
Explanation: The first action "watch" is in the past continuous tense because it describes an ongoing action that was happening at a specific time in the past. The second action "wash" is in the past simple tense because it happened at the same time as the first action.

1. Can I park my car in your garage? - The modal verb "can" is used to ask for permission. A synonymous expression could be "Am I allowed to park my car in your garage?"
2. She must be home. - The modal verb "must" is used to express a strong belief or certainty. A synonymous expression could be "She has to be home."
3. You needn't wear a tie to the interview. - The modal verb "needn't" is used to express that something is not necessary. A synonymous expression could be "You don't have to wear a tie to the interview."
4. Shall I cook spaghetti for dinner? - The modal verb "shall" is used to make a suggestion. A synonymous expression could be "Should I cook spaghetti for dinner?"
5. Gary may come round tonight. - The modal verb "may" is used to express possibility or permission. A synonymous expression could be "Gary is allowed to come round tonight."
6. You should take up a hobby. - The modal verb "should" is used to give advice or make a recommendation. A synonymous expression could be "You ought to take up a hobby."
7. Would you mind moving your car, sir? - The modal verb "would" is used to make a polite request. A synonymous expression could be "Could you please move your car, sir?"
8. She can't still be at work, it's already 6 pm. - The modal verb "can't" is used to express impossibility or doubt. A synonymous expression could be "It's impossible for her to still be at work, it's already 6 pm."
9. Can I give you a hand with that bag? - The modal verb "can" is used to offer help. A synonymous expression could be "Am I able to help you with that bag?"
10. Children must not play football in the streets. - The modal verb "must not" is used to express prohibition. A synonymous expression could be "Children are not allowed to play football in the streets."
11. I have to see the dentist. - The modal verb "have to" is used to express obligation. A synonymous expression could be "I must see the dentist."
12. The car needs filling up with petrol. - The modal verb "needs" is used to express necessity. A synonymous expression could be "The car has to be filled up with petrol."