The number of the employees has grown from 1,000 to 1,200.This means it has risen ________ 20 percent.
7. No one but her parents _____ it.
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.