补全对话
John: Uncle Smith, this is John speaking. I'm sorry to call up so late, but may I speak to Jim?
Smith: Jim is out.____
John: OK, please. Jim and I applied to go in an adventure (冒险) tour competition on the internet a week ago. Today I was told that we were accepted.
Smith: Oh, that must be dangerous.____
John: Because we want to do sports and something exciting.
Smith: You'd better not.____
John: Uncle Smith, don't worry. We can take good care of ourselves.
Smith:____
John: Yes. We are ready for it.
Smith: Good luck.
John:____
Smith: It's OK. I'll tell him to call you back later.
John: Thank you, Uncle.
A. Are you ready for it?
B. May I take a message for you?
C. You're welcome.
D. Why do you want to do it?
E. What a great idea!
F. We will worry about you.
G. Thank you very much.
的两根，求sin3θ+cos3θ及 
的值．