从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. In fact, this text tells a story of the Amber Room, _____praise the friendship between Prussians and Russians.
A. instead of B. rather than C. other than D. expect
22. These plants are watered_____.
A. each other day B. every other day
C. each of two days D. every of two days
23. Trees of this kind are so _____that they can been seen everywhere.
A. usual B. ordinary C. normal D. common
24. You’d better not_____ the radio, or you will not be able to put it together again.
A. take in B. take away C. take apart D. take out
25. Don’t worry: There is a _____bus service to the airport.
A. regular B. usual C. rare D. common
