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. Jenny found in music _______ peace which was missing in _______ world full of challenges.
A. /; the B. /; a C. a; the D. the; a
22. —How about the result?
—Well, it remains _______whether we’ve got enough support.
A. seen B. to be seen C. seeing D. to see
23. Sally looks very happy. She ________ have got the first place in the 200-meter race.
A. should B. could C. must D. might
