根据语境，从方框里选择正确合适的句子。

（Jeff and Li Lei are talking on the phone now. Jeff=J Li Lei= L）

J: Hello, Li Lei?.

L: Hi, Jeff. Are you still in Beijing?

J: Yes.

L: Well, ?

J: I'm studying English here.

L: How's it going?

J: . I'm having a good time. It's interesting to talk with the foreigners(外国人）.

L: ?

J: Sunny and warm! Do you want to come to Beijing this summer vacation?

L: Yes, but I am busy now. Could you take some photos of Beijing?

J: ! Er, er. Are you studying for a test now?

L: Yes, I don't think the test is easy. I must study hard!

J: Good luck!

L: Thank you!

A. Great.     B. I am Jeff.      C. What are you doing? D. Jeff speaking.     E. How's the weather?      F. No problem! G. Not bad.