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.
2.He seized every opportunity to appear in public: he was so anxious to be talked about
3.Is there anything else to tell her? I believe she deserves to know the state of her sick brother
4.He began writing books not because he wanted to earn a living. He wanted to be read and not to be forgotten.
5.I consider myself lucky to have been to that famous exhibition and (to) have seen so many wonderful paintings
6.He seems to know French very well: he is said to have spent his youth in Paris
7.The enemy army was reported to overthrown the defence lines and (to) have advanced towards the suburbs of the city
8.The woman pretended to be reading and not to hear the bell
9.You seem to be looking for trouble
10.It seemed to been snowing heavily since early morning: the ground was covered with a deep layer of snow
11.They seemed to be quarrelling: i could hear angry voices from behind the door
12.Perhaps it would upset her to be told the truth of the matter
13.They are supposed to have been working at the problem for the last two months
14. They seemed to have been waiting for ages