(A)
1. Microsoft developed the Windows operating system used on many home and office PCs. The Windows operating system was developed by the Microsoft company. The Windows operating system developed by the Microsoft company is used on many home and office PCs.
2. The first television set produced quite a sensation in 1939. The first television set was produced in 1939. The first television set produced in 1939 was a tiny nine-by-twelve inch box.
3. The trains equipped with robot engine drivers operate on some underground lines. The trains operating on some underground lines are equipped with robot engine drivers. The engineers equipped the new trains with robot engine drivers.
(B)
1. The electronic circuit may consist of hundred, thousands, or millions of interconnected transistors and other microelectronic components.
2. The monitor suddenly blacked out.
3. A computer virus is an unwanted program that has entered your system without your knowing about it.
4. Many viruses have spread through pirated – illegally copied or broken – games.
5. In the 1940s, scientists at Bell Telephone Laboratories invented a tiny electric switch called the transistor.
6. LCD is the part of a watch, calculator, or small computer where numbers or letters are displayed by means of an electric current that is passed through a special liquid.
7. Though first developed for military purposes, radar can be used in modern cars.
8. Improved methods of obtaining three-dimensional television pictures have been worked out on the basis of holography.
9. The Internet allows you to get information stored on other computers far away.
10. If activated, a virus takes control of the computer’s program.
11. The first time I turned on the tape-recorder, it “ate” the tape.
12. Grey Interactive TV has developed a series of interactive advertisements for the bank.