根据句意、中文提示或首字母写出单词的正确形式。

1. My uncle and cousin are _____ (警察).

2. Every day, she waters the flowers _____ (首先).

3. Look at these beautiful birds, how _____ (可爱) they are!

4. This is not my camera, it's _____  (她的).

5. There are _____ (三十) small boats on the lake.

6. When(当……时候) the light is green, we can c _____ the road.

7. Today is T_____ and tomorrow is Friday.

8. My sister is too b _____ today, so she has no time to watch the football match.

9. Millie and I often go to school t _____ because we are good friends.

10. Li Hua is a good football p _____, he is good at scoring goals.

烟管锅炉的受热管内流动的是（）。

A、水

B、蒸汽

C、烟气

D、汽水混合物