III. Choose the best answer to complete these following sentences.

11. If people drive their cars _______, they won’t get hurt themselves and others.
A. careful B. carefully C. careless.
12. She _______ won the scholarship to study abroad.
A. success B. successful C. successfully.
13. If the weather gets worse, the children _______ school for some days
A. don’t have B. won’t have C. wouldn’t have.
14. If she _______ enough money, she will buy her son a motor bike.
A. earn B. will earn C. earns
15. If everybody_______ all the trash in the trash can, the beach will not be so dirty like this .
A. put B. puts C. will put.
16. If she _______ the airport, I’ll let you know.
A. arrives B. arrive C. will arrive
17. If people solve the problems of the smoke from vehicles and factories, the air _____ pure and fresh.
A. is B. will be C. would
18. There is more pollution in the city _______ there is more traffic in the streets.
A. and B. because C. but
19. The kids didn’t go to the movie last night _______ it rained so heavily.
A. and B. but C. as
20. The bus didn’t stop _______ it was full of passengers.
A. since B. but C. and