14. I think Chinese is quite a useful language.

　　15. Many a student has asked that question.

　　16. The visitor left half an hour ago.

　　17. What a fine day it is!

　　18. How can you say such a thing?

　　㈤用在so, as, too, how +形容词这些结构里，如：

　　19. We have not had so hot a day before.

　　20. Susan is as clever a girl as Anna.

　　21. That is too difficult a book for beginners.

　　22. No one knew how serious a problem it was until later.

　　㈥出现在许多惯用语中，如：

　　23. Bob always has a bone to pick with others.

　　24. Some students turned a deaf ear to the teachers advice.

　　25. All must learn a language with an eye to mastering it.

　　26. I hope you will make an effort to attend the meeting punctually.

　　27. Jason has an aversion to being idle.

　　28. The news of Jacks sudden resignation came as a bolt from the blue.

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