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四、单项选择。(共20小题，每小题1分，计20分) 请从A、B、C、D四个选项中选择最佳的选项填空。 ( )21._____ __ Mr Smith didnt feel well, he still come to give us lessons. A.So B.Because C.Though D.As ( )22._______ students of Middle school, we must work harder than before. A.As B.Because C.For D.So ( )23.How many ______ are there tomorrow? A.flight B.flights C. fly D.flies ( )24.Im _____ frightened _______I cant say anything. A.so;that B.such; thatC.so; D.such; ( )25.______ he is very young,_____ he knows much. A.Although;but B.Although; C.;because ( )26.He is afraid of ______ planes, so he will go to Beijing by_____. A.take;train B.by;ship C.catch;car D.taking;train ( )27.Daming is a _____ boy. A.sixteen year oldB.sixteen years old C.sixteen-ye ars-old D.sixteen-year-old ( )28.I _____ my schoolbag _____ some books. A.full;ofB.filled;with C.am filled;with D.am full ;of ( )29.All living things _____ the sun for their growth. A.depend ofB.fill with C.full of D.depend on ( )30.If I learn how to swim, I ____ swim sooner or later. A.will canB.will be able toC.am able to D.will able to | 
