1.Let's keep the surface                    dirty by putting a cover over it.

A.free from         B.far from          C.apart from        D.away from

2.Don’t mention that at the beginning of the story, or it may _____ the shocking end.

A.give out                              B.give away

C.give up                               D.give off

3.Isn't it time you got down to         the papers?

A.grade             B.be graded         C.being graded      D.grading

4.The week-long rainfall has ______ landslides and flooding in the mountain areas.

A.set about         B.brought about     C.come about        D.go about

5.My grandfather often told me what he had           during the Culture Revolutionary.

A.gone against      B.gone into         C.gone through      D.gone over