Mystudentshaveasummer _______________project.(n.研究)
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Whatmakeslifedifficultisthatthe _______________offacingandsolvingproblemsisapainfulone.(n.过程)
Theyhadaslowerrateof _______________inmemory thantheothers.(n.下降)
Therearea _______________ofthingstoknowabouttheuseofhumorinaspeech.(n.夫妇,数个)
Itmaybedifficulttobelievebutin _______________thetechnologyforgrowingcropsindoorsalreadyexist.(n.事实)