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12.
He _____ (not/ hear) the thunder during the storm last night because
he _____ (sleep).
13.
We hope that scientists ______ (find) solutions to our most urgent
problems.
14.
By next decade people _______ (create) more efficient purification
equipment.
15.
What geologists ______(study)?
16.
There isn’t a cloud in the sky. It ______ (be) a lovely day.
17.
This time last year I ______ (swim) in the Black Sea.
18.
They ____ (work) at a chemical laboratory now.
19.
In 1974, scientists _______ (not / predict) an earthquake in China.
20.
They
______
(carry out) an experiment from ten till twelve o’clock in the
morning.
21.
He
_____
(solve) this
problem by 10 o’clock yesterday.
12.
He _____ (not/ hear) the thunder during the storm last night because
he _____ (sleep).
13.
We hope that scientists ______ (find) solutions to our most urgent
problems.
14.
By next decade people _______ (create) more efficient purification
equipment.
15.
What geologists ______(study)?
16.
There isn’t a cloud in the sky. It ______ (be) a lovely day.
17.
This time last year I ______ (swim) in the Black Sea.
18.
They ____ (work) at a chemical laboratory now.
19.
In 1974, scientists _______ (not / predict) an earthquake in China.
20.
They
______
(carry out) an experiment from ten till twelve o’clock in the
morning.
21.
He
_____
(solve) this
problem by 10 o’clock yesterday.
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12. He didn't hear the thunder during the storm last nightbecause he was sleeping.13. We hope that scientists will find solutions to our most urgent problems.
14. By next decade people will have created more efficient purification equipment.
15. What do geologists study?
16. There isn’t a cloud in the sky. It is going to be a lovely day.
17. This time last year I was swimming in the Black Sea.
18. They are working at a chemical laboratory now.
19. In 1974, scientists didn't predict an earthquake in China.
20. They will be carrying out an experiment from ten till twelve o’clock in themorning.
21. He had solved this problem by 10 o’clock yesterday.