根据句意和首字母提示，补全单词。

1. They are c__________ buying a new car.

2. I couldn't find a p                  place to sit on.

3. The flood in her hometown b                 out last year.

4. I know little about that. You can ask Maria because she knows the w                .

5. Every student is s                 to keep the classroom clean.

6. Mozart (莫扎特) wrote a lot of c                  in his life.

7. Have you d                  up the plan yet?

8. M                of foreigners come to visit China every year.

9. The writer is famous at home and a                 .

10. We have come to realize the i                 of learning English.

研究的可行性原则主要考虑以下几方面？（）

A.客观条件

B.主观条件

C.时机条件

D.经验条件