Task 2. Complete these conditional sentences with the verbs in the correct tense.

1 She can help you if you

2 If she

(ask) her.

(have) a free evening tomorrow, she will take both of you to the cinema.

3 If you heat water to 100 degrees centigrade, it

Task 3. Open the brackets in the Passive:

1) Many rare animals

2) Large areas of Brazilian rainforests

(boil).

(already kill) by cruel people so far.

(cut down) annually.

(solve) by local authorities last

3) Some environmental problems in the area

year.

4) Wildlife

(destroy) by human activity day after day.

Task 4. Complete the sentences using discover","discovery" or "invent", "invention" in the right form

1 When did they

2 Who

3 Australia was

oil in the North Sea?

the computer?

for Europeans by James Cook.

4 In what country was money first

5 Writing was probably the most revolutionary of all human

6 The

of the atom meant the beginning of a new era in physics.