题目内容：

口语应用。根据对话的内容，用适当的句子补全对话。（满分10分）

A: Have you seen Jim these days?

B: No, he’s gone to Japan to see his grandfather.

A: 20. ____________________________

B: Yes, he lived there before he came here.

A: 21. ____________________________

B: About one month.

A: 22. ____________________________

B: Yes, I’ve just received a letter from him.

A: 23. ____________________________

B: He said he had a very good time there and he also wanted me to give his best wishes to you.

A:24. ____________________________