第一节 单项填空（共15小题；每小题1分，共15分）
从每题所给的a、b、c、d四个选项中，选出可以填入空白处的最佳选项。
21. it is not immediately clear the financial crisis will soon be over.
a. since b. what c. when d. whether
22. only when _______ according to the directions strictly will the medicine work well.
a. taking b. to take c. taken d. being taken
23. it’s nothing unusual to experience failure, and ought we to be so discouraged.
a. in no time b. by all means c. by no means d. in any condition
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