一、根据句子意思和汉语提示写出适当的单词。
1. (操练) more and you will be better at dancing.
2. Beijing opera is becoming more and more (受欢迎的) with foreign people.
3. I gave my mother a watch as her (第四十) birthday present last week.
4. The temperature is (在……的下面) zero. You’d better put on your coat.
5. Each Chinese should try his best to help control the air (污染).
6. The exchange students will (离开) for their country soon.
