补全对话。从方框中选出适当的句子补全对话。A: Lucy, why are yo
题型：完形填空
问题：
补全对话。从方框中选出适当的句子补全对话。 A: Lucy, why are you going out 小题1:? B: That’s the sound of a truck collecting rubbish. A: Do you mean you have to take the rubbish to the truck? B: Yes. You know 小题2: is our duty. We should help protect the environment. A: I agree. 小题3:, we must do something around the neighbourhood. B: Sure. It is our duty to keep the environment clean and tidy. If we make a contribution to protecting the environment, 小题4: A: That’s right. We mush try our best to make our country more beautiful. So we should 小题5: to improve the environment.
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