17. Will you have another cup of tea?

你再喝一杯茶吗?

18. This boy is very smart; he may be another Edison.

这男孩很聪明，他可能成为另一个爱迪生。

19. That's quite another matter.

那完全是另一回事。

20. He has had no answer to his letter.

他的信没收到回信。

21. Do you know the answer to this question?

你知道这道题的答案吗?

22. He answered that he knew nothing about it.

他答复说关于此事他一无所知。

23. I was anxious about the children when they didn't come back home from school.

孩子们放学后没有回家，我非常担心。