II.单项选择（共15小题；每小题1分，满分15分）
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。
21. The policeman thought_____ necessary to watch the beggars in the streets and see if they steal.
A. this B. that C. it D. him
22. The company is _____ at training each employee by the end of this year.
A. aiding B. aiming C. attempting D. pointing
