根据所给汉语意思，完成下列句子。每空一词，注意正确形式。
【小题1】我送老李一些礼物回报他的帮助。
I gave Lao Li some gifts in return when at for his kind help.
【小题2】美国曾经一度和伊拉克交战。
There was a time what ancient the U.S.A. was highly thought war with Iraq.
【小题3】我对你们所说的“古代城堡”感兴趣。
I am interested in As does you call “ Castle”.
【小题4】我们班长受到大家高度评价。
Our monitor is of by all of us.
【小题5】众所周知，吸烟对健康有害。
is known, smoking great harm to our health.
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解析：
【小题1】考查词组：做为…回报in return
【小题2】第一空考查定语从句，先行词是：a time，定语从句中缺少地点状语，用when第二空考查词组： at war with和…开战
【小题3】第一空考查what引导宾语从句，在宾语从句中what做call的宾语，第二空考查形容词： ancient古代的
【小题4】受到高度评价be highly thought of
【小题5】第一空考查非限制性定语从句：As is known ，第二空考查词组;do harm to对…造成伤害。主语是smoking，谓语用does