Ivan326154353

20.12.2020 22:48

Английский язык

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13.
Read the text below. For each empty space (1-12) choose the correct answer (А, В, C or D).
Recently scientists (1) __________________ more about life on planet Earth and now they (2) __________________ better where to look for life in outer space.
For a long time, scientists (3) __________________ that life (4) __________________ on sunlight for energy. Then, in 1978, a submarine (5) __________________ to the bottom of the Pacific Ocean. Although there (6) __________________ no sunlight, they (7) __________________ tube worms, clams and crabs, and other life forms.
Since then scientists (8) __________________ at the life on earth in other difficult environments — dry, cold and hot - and (9) __________________ that water is the key. Wherever there (10) __________________ water, life (11) __________________ exist. So scientists (12) __________________ to search for water in the solar system.

A В C D
1 found out has found out find out have found out
2 knew have known know known
3 believe believed believes have believed
4 depended depend depends have depended
5 dive have dived has dived dived
6 were was has been have been
7 have found finds found has found
8 have looked looked looks has looked
9 found have found has found finds
10 was has been is be
11 could will be able was able can
12 began has begun have begun begin