21.---I went to the beach and got plenty of rest.
--- __________You looked tired last time I saw you.
A.I had hoped so. B. Really? C. I’m glad you did. D. That sounds a good idea.
22.The decision _______ ,what is it to be done now is how to carry it out.
A .been made B. has been made C. having been made D. having been making
23. I never go past that house _______ think of the happy life we had in the old days.
A. where B. and C. that D. but
24. This is not an economical way to get more water; ________, it is very expensive.
A. on the contrary B. on the other hand
C. in a word D. rather than
25. Once lost, _________.
A. it is hard to get such a chance again B. one can never get such a chance again
C. such a chance will never come again D. to get such a chance will be difficult