couldyouhelpme?
1.youmustmakeyournewhousecleanandsafe_____youmovein.
AbecauseBwhenCbeforDuntil
2.--I'mgoingtohangzhouforaholidaythisweeekend.
_____youarethere,couldyoubuymesomegreentea?
AbecauseBwhileCAfterDthough
3.April1stistheday_____iscalledAprilFool'sDay.
AthatBwhoCwhenDwhere
4.thegirl_____anenglishsonginthenextroomisTom'ssister.
AwhoissingingBissingingCsangDwassinging
5-didJackcometoourpartyyester
--no,he_____
Awasn'tinventedBdidn'tinviteCisn'tinvited
Dhasn'tinvited
可不可以稍微讲下原因啊