4．
选用表格内合适的句子完成对话，将序号填在横线上。
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a. What can we do?
b. Where can we put it?
c. We should protect it.
d. Everyone shouldn't litter.
e. We can draw pictures on it.
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Sam: Bobby, the environment on Earth is not so good now.
Bobby: The Earth is our home.
Sam: You're right. But not all students know this.
Bobby:
Sam: Let's make a poster and tell them about it.
Willy: Good idea!
Sam: Let me draw the Earth first. Then some green trees, a river…
Willy: Let me draw a rubbish bin.
Bobby: OK. What a nice poster!
Sam: Let's put in at the school gate.
Bobby: Great! All students should protect the Earth and keep it clean.
