21. You_____be hungry already—you had lunch only two hours ago.

A. wouldn’t         B. can’t          C. mustn’t      D. needn’t

22. Our bodies are strengthened by taking exercise. ___,our mind are developed by learning

A. Probably        B. Likely          C. Similarly    D. Generally.

23. “_____the election is over, ” said Powell, “the time has come for me to step down as secretary of state and return to private life. ”

A. Now that        B. In case          C So long as       D. As far as