Theyhadaslowerrateof _______________inmemory thantheothers.(n.下降)
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Therearea _______________ofthingstoknowabouttheuseofhumorinaspeech.(n.夫妇,数个)
Itmaybedifficulttobelievebutin _______________thetechnologyforgrowingcropsindoorsalreadyexist.(n.事实)
Howweliveourlivesaffectsthe _______________ .(n.环境)
Expertssayindoor _______________solvesmanyproblems.(n.农业)