Night________(fall),wehurriedhome.
Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Howlong________they________(dig)theditch?
Ipreferthisdiagram________thatone.