根据对话内容及括号内所给的提示填空。

A: Hey, Ben! Did you talk about camping with your father last night?

B: Yes. Last night I didn't go to bed (直到和他交流).

A: Really? Did your father agree?

B: Yes. In the end he agreed (尽管他不想让我去野营) at first.

A: Great. Should I say to my father about this?

B: Yes, I think you should (tell) your father about it. We (不应该做事不告诉父母).

A: Maybe you're right. But my father is in China. I can't (talk) with him.

B: (你为什么不给他打电话)?

A: He's too busy. I'm afraid he won't pick it up (接电话).

B: (你什么不给他发一封电子邮件) then?

A: If he doesn't reply to my e-mail, what should I do?

B: Very easy! You could (call) your grandpa and ask him to talk to him about it.

A: Mm, that's a good idea!