补全对话.（填入适当的句子完成对话）
A：Can you go fishing with me this weekend?
B：----------------------（1）
A：What a pity!What are you going to do this weekend?
B：---------------------（2）
A：Hou often do you visit your grandparents?
B：Twice a week.
A：---------------------(3)
B：It is15 kilometers.
A：-----------------------(4)
B：It takes me about forty minutes to get there.