1.--AreyousurethereareUFOS?---Sorry.I'mnotsure()that
A.toB.atC.ofD.in
2.Hisjokemadeus()upanddown.
A.tolaughB.laughC.laughingD.laughed
3.Peopleuserobotsfor()
A.doboringworkB.doboringworksC.doingboringworkD.todoboringjobs
4.MyparentswillgotoBeijing()
A.threedaysagoBarterthreedaysCinthreedaysD.beforethreedays
5.Areyousure()helives?
A.whereB.whichC.whatD.when
6.Youhavetodoitinadiffrentway()adiffrentsituation.
A.onB.inC,forD.at