The floor does not look so bad when ________ (sweep) clean.
swept
暂无解析
________(catch)intherain,hewaswettotheskin.
Heaskedmewhethermybrother________(fly)toBeijing.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Howlong________they________(dig)theditch?