请从A、B、C、D四个选项中选出可以填入空白处的最佳选项。

16. David comes from______ America and he is ______honest boy.

A. an, an     B. /, an                   C. the, a       D. an, the

17. ---_____do you tell him the news?

   A．How, sending   B .How, send   C. What, sending   D. What，send

18. ---Is your father a teacher?

     A. were   　     B. used to      　C. used to be 　 D. is

19. ---Who is the tallest boy?      

 ---It ______ be John.. John is of medium height.

20. ---Where are you going, Jack?

  --- My hair is too long. I’ll have it _______.

  A. cut            B. cuts           C. cutting          D. to cut

21. Many Chinese students found______ difficult to learn English grammar.

    A. that                   B. it         C. this         D. one

22. These young trees must ______.

A. look after well         B. be look after well 

  C. be looked well 　      D. be looked after well

23. ---What if I have to go there and know nothing about it?

   --- If I______ you, I would try to find some information about it on the Internet.

24. ---I will go to Beijing for a visit with my family during the winter holiday. 

   ---______.

    A. So do I    B. So I do 　    C. So will I 　      D. So I will