1.-Ialwayslookbothwaysbeforecrossingthestreet.
-You'reright.Youknow,accidentsoften______fromcareless.
A.ariseB.arearisenC.havearisenD.willbearisen
2.Thebook______andIamsuremostofthestudentshavenodifficultyunderstandingit.
A.willsimplifyB.willbesimplifiedC.hassimplifiedD.hasbeensimplified