题目内容：

根据对话内容，在空白处写出恰当的句子，使对话意思连贯完整。所写的句子应与所给的标点符号一致。（共5个句子，每句1分，满分5分）

A: Bob, what are you doing?

B: 1. _____________________. The letter is about bad habits.

A: What do you mean?

B: I see some people throw litter around. And some often waste water. You know，water is very important to us.

A: You are right2._________________ ?

B: To the TV station. I hope they can call on people to protect our environment?

A: Then what should we do to protect our environment?

B: I’d like to go to the People’s Park with my friends this Saturday. 3._________________ ?

A: Yes, I’m free. 4.________________ ?

B: We’re going to collect rubbish there.

A: Good idea! I’d like to join you. 5._________________ ?

B: We’ll meet at 8 o’clock at the gate of the park. See you then!

A: See you.