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: _____________________. 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 right_________________ ?
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. _________________ ?
A: Yes, I’m free. ________________ ?
B: We’re going to collect rubbish there.
A: Good idea! I’d like to join you. _________________ ?
B: We’ll meet at 8 o’clock at the gate of the park. See you then!
A: See you.