Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
A、canyouThefloordoesnotlooksobadwhen________(sweep)clean.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Tosucceedinascientificresearchproject________.
You________gonow.It’sgettinglate.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
