5、endduringhisstayinTianjin.A.seeB.seeingC.sawD.tosee14.Attimes,parentsfinditdifficult withtheirteenagechildren.A.talkB.talkedC.talkingD.totalk第10页共10页15.Thechildrendecide theirschoolyardthisFridayafternoon.A.cleanB.tocleanC.cleaningD.cleaned16.--- doyou t