Choose the right variant (a, b, c or d)
1. These phenomena ... since last century.
a) have been observed c) are observed
b) were observed d) are being observed
2. In a few years from now, this work ... us many discoveries of still greater importance.
a) has brought c) brings
b) will be brought d) will bring
3. For hundreds of years people ... of cosmic flights.
a) are dreaming c) have been dreamed
b) have been dreaming d) are being dreamed
4. The head of the laboratory ... to check everything by himself.
a) are c) had
b) be able d) must
5. There is no doubt that radio and TV are among the … miracles of modern science.
a) most great c) greatest
b) more greater d) most greatest
6. The question ... at next Thursday's meeting concerns all of the laboratory staff.
a) to be discussing c) being discussed
b) discussed d) to be discussed
7. I watched them ... the equipment.
a) installed c) were installing
b) installing d) had installed
8. Nobody expected them ... a discovery.
a) to make c) made
b) would make d) make
9. The value of his research ... not to be underestimated.
a) are c) can
b) must d) is
10. He must ... his attempts to obtain better results several years ago.
a) give up c) gave up
b) have given up d) has given up
11. The early users of telephones never dreamed that there ... a wireless telephone.
a) were c) would be
b) will be d) had been
12. This kind of method will be helpful provided more data ... available.
a) will become c) became
b) becomes d) become
13. If the checking up ... so much time, we would have completed our work long ago.
a) hadn’t taken c) wouldn’t take
b) didn’t take d) wouldn’t have taken
14. If he was able to complete his experiment, he ... you with the results obtained.
a) surprised c) would have surprised
b) would surprise d) had surprised
15. When … individually, these facts are not at all convincing.
a) considering c) to consider
b) were considered d) considered
16. ... several alternatives, they decided to consider the last two in more detail.
a) Having been discussed c) Having discussed
b) Discussed d) Had discussed
17. ... data during research is not an aim in itself.
a) Accumulating c) To be accumulated
b) Accumulate d) Being accumulated
18. While ... a number of problems, this approach creates a few others.
a) solving c) was solving
b) solved d) having solved
19. ... this goal, a new approach was adopted.
a) Achieve c) Have achieved
b) To achieve d) Achieved
20. For us ... this problem was no simple matter.
a) solve c) to solve
b) solving d) solved