1. 根据句意及汉语提示填写单词。

1. （1） How many countries are there in the (世界)?

3. （2） I don't know the (答案) to the question.

5. （3） Miss Yang is a good teacher. She is very (受欢迎的) with the students.

7. （4） Lily and Lucy are in the same school, but in (不同的) classes.

9. （5） That's a good (主意).