从a、b、c、d四个选项中,选出可以填入空白处的最佳选项。
21.---tony, i am leaving for
---__________________!
a. take care b. what a pity c. have a good trip d. congratulations
22. ___________ of tigers has reduced rapidly in the past fifty years.
a. a number b. numbers c. the number d. a large number
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