题目内容
AIDS is the biggest health _______ we have had to face this century.
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The rain was so heavy and the road so muddy that it took us all day to reach our _____.
All her students agreed that she was a(n) _______ and caring teacher.
It seems that the little boy could never forget the terrible experience in his _________ school.
The team was required to _________ a solution(解决方案) to the problem by the end of this month.
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