1. We hoped that they ... this problem.

A. will solve

B. solve

C. is solving

D. would solve

2. They say that the ozone layer ... gradually.

A. is destructing

B. was destructing

C. destruct

D. destructed

3. They were sure that those pesticides ... the soil.

A. were ruined

B. ruined

C. ruin

D. are ruining

4. They were afraid that those fertilizers ... the soil.

A. would damage

B. damage

C. are damaging

D. damages

5. The scientists told them that the reproductive cells ... .

A. had been destructed

B. will destruct

C. would destruct

D. are destructed

6. He remembered that pollution of soil ... the amount of available lands.

A. reduces

B. had reduced

C. reduce

D. will reduce

7. They knew that environmental pollution ... disastrous processes.

A. caused

B. causing

C. cause

D. will cause

8. They were sorry that he ... unemployed.

A. was

B. is

C. were

D. will be

9. They say that environmental pollution ... global warming.

A. cause

B. causes

C. would cause

D. have caused




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