三道初中英语单选1.Ifeveryonemakesacontribution_______theenvrionment,ourcountrywillbecomemorebeautiful.A.toprotectB.inprotectingC.toprotectingD.forprotecting2.Manypeoplewelcomethe"Harm-freeInternet",butwhatdomanyscho

　　三道初中英语单选

　　1.Ifeveryonemakesacontribution_______theenvrionment,ourcountrywillbecomemorebeautiful.

　　A.toprotectB.inprotecting

　　C.toprotectingD.forprotecting

　　2.Manypeoplewelcomethe"Harm-freeInternet",butwhatdomanyschoolstudents_______it.

　　A.hearofB.thinkof

　　C.lookoverD.talkabout

　　3.-Timetogotobed,mary.

　　-Oh,Mum,lwon'tgotobed_____Ihavefinishedmyhomework.

　　A,afterB.sinceC.untilD.assoonas

　　第二个请解释一下