We last night , but we went to the concert instead .
The official made the demand that the soldiers ____ at once _____ battlefront.
All those second-hand goods are sold at ____ before.
——The switch to more low-carbon energy, I think, is _____. ——I agree with you.
Many a student ____ going to have themselves ____ in the hospital.
Three minutes earlier ____ we could have caught the early train to Philadelphia.