根据句意及首字母提示补全单词

1. P____ the teenagers what they will do is not easy.

2. Our school built a new a____ in the school so that new foreign teachers can live inside it.

3. Big cities are usually c____ in the main streets. There are people here and there.

4. My mother says I am old enough to d____ myself now. Look! I wear all these clothes myself.

5. Fei Junlong and Nie Haisheng are famous Chinese a____.

当飞机飞行高度增加时，如果混合比杆没有重新设置，将会使（）.

A.进入汽缸的混合气变富油

B.进入汽缸的混合气变贫油

C.进入汽缸的混合气油气比不变