51.A.where B.which C.that D.and
50.A.food B.energy C.beauty D.charming
49.A.cleaning B.heating C.cooling D.lighting
48.A.for B.as C.so D.because
47.A.compound B.chemical C.ecological D.industrial
46.A.speed up B.carry on C.slow down D.smooth away
45.A.Depending on B.Judging by C.Protected from D.Suffering from
44.A.troubles B.great efforts C.a few months D.years
43.A.on purpose B.for wood C.by chance D.at ease
42.A.designers B.purposes C.disadvantages D.advantages
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