问题描述：
15.–Howoldareyou?-I’mfifteen,butIamalreadylivingmyself.A.inB.atC.byD.for
15.–Howoldareyou?
-I’mfifteen,butIamalreadylivingmyself.
A.inB.atC.byD.for
16.-Whyareyoubackhere?
-Badluck.Wethelastbus.
A.missedB.lostC.tookD.reached
17.MissGreengoestothedoctor’sMondaymorning.
A.onB.inC.atD.for
18.Ourteacher,MissGreens,Englishontheradiothedaybeforeyesterday.
A.teachesB.taughtC.willD.hadtaught
19.-Hello,isthatFrank?
-No,it’s,Mary.
A.IB.myC.mineD.me
20.-.
-Certainly.Onemoment,please.
A.Hello,Annhere.B.CanyoulookforAnn,please?C.MayIspeaktoAnn,please?D.OK!
