题目内容

Therearea _______________ofthingstoknowabouttheuseofhumorinaspeech.(n.夫妇，数个)

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Itmaybedifficulttobelievebutin _______________thetechnologyforgrowingcropsindoorsalreadyexist.(n.事实)

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It'sonlybecauseofproblemthatwe _______________mentallyandspiritually.（n.发展，成长）