Choose the correct option to complete the sentences.

1. The air has been polluted_________________emissions from car engines

A. since B. because C. because of D. due of 

2. Forest fires happen too often, _________________ the air is polluted

A. 30  B. because C. since D. due to 

3. Don't drink that water. It's_________________

A. damaged B. dumped C.clean D. contaminated

4. By the time we got to the cinema, the film_________________

A. had started B . started C. starts D. starting

5. If you_________________the president, what would you do to help the environment?

A. are B. had been C. were D. have been

6. Eating too much sugar can_________________to health problem.

A. cause B. lead C. make D. due to

7. Emergency teams are still removing the_________________from the plane crash

A. dirt B. debris C. dust D. dirty

8. The heavy rain has caused_________________in many parts of the country.

A. floods B. storms C. drought D. tornado

9. The team's success was largely_________________to her efforts

A.Lecause B.due С. since D. result

10. If you_________________the president, what would you do to help the environment?

A. are B. had been C. were D. is