根据首字母或中文意思完成句子

1. Though he has studied English for only two years, he can speak it f____.

2. Our baby is just starting to speak; he has a v____ of about ten words.

3. Try to learn by heart these English words and ____ (短语).

4. Many ancient ____ (文化) are only known through archaeology (考古).

5. The v____ from America to France used to take two months.

6. He looked calm, but a____ he was very nervous.

7. An ____ (官员) of the local government promised to deal with the matter.

8. An e____ is a machine for raising and lowering something.

9. So far, the police are still uncertain about the murderer's ____ (身份).

10. As can be easily seen, not everybody is satisfied with the ____ (现在的) situation.

压强是反映压力作用效果的物理量，压强的单位是帕，10帕表示的物理意义______．