7. They are in great need of teachers with rich e_____________.

6. Automobile race is an a_____________ sport.

5. The g______________ of　 Hangzhou has determined to turn the city into a real paradise on the Earth.

4. Are there any s_____________ between drama and opera?

3. You use b____________ to describe things and activities that are very important and necessary.

2. The n________________ price of a ticket is $230!.

1. A s___________ is a small narrow river.

20．The man will have to wait all day______ the doctor works faster.

　 A. if　　 B. unless　　 C. whether　　 D. that

19．Your homework is all right,________, you can do it better.

　 A. instead　 B. while　　 C. but　　 D. however

18. The number of students in our school______ 2,000.　 A number of them______ hardworking.

　　 A. are, is　　 B. is, is　　 C. is, are　　 D. are, are