1) I want to ask her if she (practises) playing the piano in order to improve her skill.
2) If someone rings you up, I'll (tell) you at once.
3) I think I'll do it at the weekend when I (have got) a bit more time.
4) If the bird is disturbed, it (leaves) the nest.
5) Do you know when she (will be) back?
6) We'll have the party in the garden if the weather ... (is) good.
7) If I don't get enough sleep, I (get) a terrible headache.
8) I wonder if you (recognize) Bill whom you haven't seen for a long time.
9) What do you want to be when you (grow up)?
1. a
2. b
3. c ?
4. a
5. c
6. a
1. Mouse is a device to move the cursor or pointer on a display screen.
2. Because the connecting wire looks like a mouse tail.
3. Mice usually have two buttons and sometimes as many as three, which have different functions depending on what program is running.
4. The mouse was invented by Douglas Engelbart.
5. In 1963.
6. Stanford Research Center.
7. Mice can be:
1. Mechanical with a rubber or metal ball that can roll in all directions. Mechanical sensors in the mouse detect the direction the ball is rolling and move the screen pointer.
2. Optomechanical with optical sensors to detect motion of the ball.
3. Optical with a laser to detect the mouse’s movement. Optical mice have no mechanical moving parts but they are more expensive.
4. Cordless infrared mice send infrared or radio waves to communicate with the computer.
3
1. There are men on bicycles.
2. These stories are very interesting.
3. These children are my sons.
4.
1. Usually the classes begin at 9 o’clock.
2. John is playing a game of tennis. He has been playing for 2 hours.
3. Now Lena is waiting for Dennis at the museum.
