If you don’t study hard, you’ll regret, _____ you?
6. The Olympic Games _____ held every _____ years.
5. About 40 _____ of the population of that country _____ on farms.
4. _____ can be done _____ been done.
3. He played on the _____ for two hours and when he returned he found half his goods _____ stolen.
2. The League secretary and monitor _____ asked to make a speech at the meeting.