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. A discount has been given by company.
3. The deadline was missed by them.
4. Some improvements were recommended by them.
5. Sea water is pumping on the green house roof by them.
6. Award of €65mln to the company researching the most promising micro nano scale technology was announced by the government.
7. Research studies and preliminary analysis are normally produced by us.
8. Ancient paper entirely of rags was made by them; Modern paper from wood pulp which is a faster and cheaper alternative was made by us.
9. The longest bridge in the world was designed by us.
10. The speakers were dented by somebody .
11. The cover of the plug was cracked by them.
12. The manual was tored by someone.
13. Sputnik was launced on the 5th October 1957 by the Russians.
14. launched Galileo, a global navigation satellite was launched by the Europeans.
15. Our office computers were attacked two hours ago by a virus .