补全对话根据所给对话， 填写适当的内容，使其完整、正确(每空词数不限)。

A: Mark, you look unhappy.?

B: Oh, I failed the English exam.

A:. But please don't give up your English.

B: Maybe my way of learning English is not good.

A:?

B: Um...I only learn it by doing English exercises every day.

A: Well, that's not enough.

B:? Can you give me some advice?

A: Of course. You'd better read more English books, take notes in class to learn grammar, listen to English tapes to improve your listening and so on.

B: It's very nice of you to tell me how to learn English. Thanks so much.

A:.