【1.Therearenotalwaysgoodplacesto____A.liveB.liveinC.sleepD.stay2.-Doyouknowthetwoboysoverthere?-Theone____thecoolsportsshoesismyfriend,Lucas.A.inB.onC.wearsD.of3.Ifpeople____cuttingdowntheforest,theywillhavenowhere】

　　1.Therearenotalwaysgoodplacesto____

　　A.liveB.liveinC.sleepD.stay

　　2.-Doyouknowthetwoboysoverthere?

　　-Theone____thecoolsportsshoesismyfriend,Lucas.

　　A.inB.onC.wearsD.of

　　3.Ifpeople____cuttingdowntheforest,theywillhavenowhere____

　　A.keep;toliveinB.keep;tolive

　　4.-Excuseme.Couldyoutellme____lateron?

　　-Waitaminute.Itiscomingintenminutes.

　　A.ifthenexttrainarrivesB.ifthenexttrainwillarrive

　　C.whenthenexttrainarrivesD.whenwillthenexttrainarrive

　　回答的时候请给出解释，我不太明白，