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.

小测验
1.The whole class _____ the teacher attentively.

The company had about 20 notebook computers but only one-third _____ used regularly. Now we have 60 working all day long.

— How is the test that you took yesterday?
— Unfortunately, not even one of the hundred students who took the test ______ passed.

Many a student ____ going to have themselves ______ in the hospital.

Sitting at the back of the room but in front of some old men and women ______ a very shy girl with two bright eyes.