1. 根据情境，为下列句子选择正确的答案。

A. Take turns. B. Keep your desk clean. C. Keep to the left. D. Talk quietly. E. Slow down.

1. （1） Lucy is walking in the street.
3. （2） Her father happens to meet a yellow light.
5. （3） Xiaoming is drawing some pictures on his desk.
7. （4） They are talking in the library.
9. （5） Can we use your pencils?