单项填空（共10小题；每小题1.5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。
1. As environment protection is becoming _______ public concern, _______ government is determined to pay more attention to the issue.
A. 不填；the B. a; 不填 C. the; a D. a; the
2. The company takes in any good wo rkers _______ sex, age or background.
A. regardless of B. on account of C. in terms of D. in spite of
3. Mr. Wang told us that he would devote all the time he could spend _______ his oral English before going abroad.
A. improve B. to improve C. improving D. to improving
