21. Yesterday ____ 8-year-old boy fell into the river. _____ boy was saved by _____ policeman.

A. an, A, a        B. an, The, a          C. a, The, the         D. a, An, the

22. It’s careless ______ him to make the same mistake again. I think it important ______       him to be more careful next time.

A. for,for                  B. for; of                C. of; of             D. of; for

23.  --        easy work it is!

--If you work harder, it’ll get       .

A. What a; easiest                                           B. What; easier           

C. How; harder                                              D. How a; easiest