21. It does not alter the fact that he was the man ________ for the death of the little girl.
A) accounting B) guilty C) responsible D) obliged
22. Medical care reform has become this country’s most important public health ________.
A) question B) stuff C) matter D) issue
23. Not that John doesn’t want to help you, ________ it’s beyond his power.
A) but that B) for that C) and that D) in that
24. I used to smoke ________ but I gave it up three years ago.
A) seriously B) heavily C) badly D) severely
25. The doctor told Penny that too much ________ to the sun is bad for the skin.
A) exposure B) extension C) exhibition D) expansion
答案： 21-25 CCABA
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