A：Lucy，why are you going out after hearing the sound? 

B:1

A：Do you mean you have to take the rubbish to the truck? 

B：Yes. 2 We should help protect the environment.

A：I agree. 3

B：Sure. It is our duty to keep the environment clean and tidy. 4

A：That's right.5 So we should do something useful to improve the environment.

A.   We should take it easy after hearing the sound.

B.   If we make a contribution to protecting the environment, the world will become much more beautiful.

C.   We must do everything useful we can.

D.   That's the sound of a truck collecting rubbish.

E.    Wherever we live，we must do something around the neighbourhood.

F.    You know taking care of the environment is our duty.

G.   We must try our best to make our country more beautiful.

1.__________ 2._______  3.__________

4._______  5.__________

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