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. Neil _______ in Xiamen for five years before he finally decided to go back to Scotland.
A. has been B. was C. is D. will have been
22. With world economic crisis worsening, people _______ the government for more unemployment benefits.
A．apply for B．go for C．appeal to D．approve of
