1. 根据句意及首字母或汉语提示，填写句中所缺单词。

1. （1） My sister likes playing the (钢琴).

3. （2） Our English teacher is (友好) to us.

5. （3） We'd like to (加入) the cooking club.

7. （4） W all of you to our city.

9. （5） Lily's grandparents are good at (唱歌).