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。
例：It is generally considered unwise to give a child______ he or she wants.
A. however B. whatever C. whichever D. whenever
答案是：B
21. During ______ afternoon, the rain became smaller, but towards__________ evening, there was a sudden landslide that buried the village.
A. /; the B. the; / C. the; the D. an; the
22. It is reported that the ______ in Libya is hotting up.
A. strength B. violence C. power D. activity
