21.Only the hope that the rescuers were getting nearer        the trapped miners.

A. suspended      B. subscribed       C. sustained        D. suspected

22.From my point of view, there’s little chance that we will be successful in trying to change the present situation. ________, it is important that we try our best.

A. Meanwhile      B. Otherwise       C. Therefore         D. Nevertheless

23.“It might have saved me a lot of money”, Mr. Chen sighed, “________ timely from the stock market this July”.

A. did I withdraw   B. should I withdraw   C. have I withdrawn  D. had I withdrawn

24.One of the true tests of leadership is the ability to recognize a problem ________ it becomes an emergency.

A. when           B. before            C. after          D. unless