1. 选择合适的短语完成对话。

1. （1） —Can you clean your room   ?

   —Yes, I can.

3. （2） —Were there many pandas  

   —Yes, there were many pandas in the past.

5. （3） —Lock the door when you leave.

   —OK, Mum.

7. （4） —How did people wash clothes in the past?

   —They washed clothes .