How long ________ they ________ (dig) the ditch?
have … been digging
暂无解析
________(fail)severaltimes,theyneedsomeencouragement.
Iwonderifhecouldgetit________(do)beforetomorrow.
I prefer this diagram ________ that one.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Matter is the name ________ (give) to everything which has weight and occupies space.
