Had I known about this computer program,a hugeamount of time and energy ______. [ ]

arethe Olympic Games held–Every four years.

He decided that he would driveall the way home instead of____at a hotel for the night.[ ]

Professor Tang didn’t give us a speech today．It washe had a traffic accident on the way to school

I’ll go for a school trip.—I hope you have a good trip.—__________