5. He _______________ himself to be a successful man.

4. 　_________________ the rubbish in Beijing is a big problem.

3. It is sometimes difficult to ___________ useful information as we have so much information to choose from.

2. How much will you _____________ for operating on her?

1. There is no ___________ that you will get through the test.

10. I look younger than my age. That’s ____________________ continuous exercise.

练习四(Unit 16)

9. I received at least 5 ______________ gifts at my birthday party.

8.You have characters playing different roles and ____________________ a story.

7. Don’t ___________ in their argument.

6. Is the book worth ____________ ?