Choose the proper form of the verb. 1. Beginning in 1965, the integrated circuit to replace the transistor in machines now called third-
generation computers.
a) have begin b) beginning c) begin d) began
2. Silicon because it is semiconductor.
a) is used b) are used c) will have used d) would used
3. He the machine the Difference Engine because it worked by solving what mathematicians call
“difference equations”.
a) will call b) call c) called d) calls
4. Also in 1962 the first removable disc pack .
a) marketed b) will marketed c) was marketed d) were marketed
5. A trackball a stationary device to the mouse.
a) is related b) has related c) have been related d) will related
6. All these new developments the second generation of computers less costly to operate.
a) maded b) will marketed c) made d) make

26. My brother started (smoking) last year.
27. Her condition began (to grow) worse.
28. It was getting dark and storm clouds were beginning (to form), but they continued (walking).
29. After talking about his work he went on (to tell) us about his trip to France, which was a great relief for if he had gone on (talking) about his work we would have been bored.
30. The author gives an unfavourable description of the queen's character. Yet then he goes on (to say) that she was loved by most of her subjects.
31. The girls went on (giggling) and everybody was beginning (to be) annoyed.
32. Do you mean (to say) that my father is a liar?
33. I understood that it would mean (telling) the whole truth.
34. I think you should stop (coming) late.
35. I don't think Mary ever stopped (thinking/to think) what people might think about her behaviour. оба могут быть
36. We seldom stop (to consider) how few true friends we really have.

1) is coming (в данную минуту подходит)
2) will... work
3) is swimming
4) are listening
5) сомневаюсь, но кажется does ... wear (постоянно, что ли, носит пальто???)
6) is sleeping
7) sits ... has (тоже сомнительно, потому что обозначает постоянное действие, может быть is sitting... is having , но нет четкого указания, что действие происходит прямо сейчас)
8) is looking
9) are preparing
10) snows (хотя словари говорят о возможном двояком написании - можно и is snowing, что так, что так будет значить, что сильный снегопад происходит в данный момент)