1. 根据句意及首字母或汉语提示完成单词。

1. （1） There are many English (课程)for us to choose.

3. （2） Is there a (可能的)chance of success?

5. （3） My mother is ill, so I have to stay at home (代替) of going to school.

7. （4） (曾经)we lived in London.

9. （5） You must act carefully according to these (指示).