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: 小题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 right小题2:_________________ ?
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. 小题3:_________________ ?
A: Yes, I’m free. 小题4:________________ ?
B: We’re going to collect rubbish there.
A: Good idea! I’d like to join you. 小题5:_________________ ?
B: We’ll meet at 8 o’clock at the gate of the park. See you then!
A: See you.
小题1:I’m writing a letter
小题2:Whom are you going to give / send it to
小题3:Are you free then
小题4:What are you going to do there
小题5:When and where shall we meet
题目分析：
小题1:根据上文，你正在做什么。及后文这封信是关于坏习惯的。可知填I’m writing a letter，我正在写信。
小题2:根据后文回答To the TV station.，可知上文问你打算给谁写。故填Whom are you going to give / send it to。
小题3:根据后文回答Yes, I’m free可知上文是一般疑问句，故填Are you free then？
小题4:根据后文回答We’re going to collect rubbish there.可知上文问What are you going to do there
小题5:根据下文回答We’ll meet at 8 o’clock at the gate of the park.可知上文问时间和地点，故填When and where shall we meet。