3.　　 Shanghai ______________ in the east of China.

2.　　 Nobody would believe him because he often __________ .

1.　　 He was very tired. As soon as he got home, he ____________ on his bed and went to sleep.

6.　　 There aren’t any classes today. He ___ be in the classroom now.

5.　　 The radio says it is fine today. So it ___ be rainy.

4.　　 Please don’t skate on the thin ice. It ___ be dangerous.

3.　　 You ___ play in the streets. It’s too dangerous.

2.　　 Half an hour ago, I received my uncle’s telephone call from Sichuan, so he ___ be in the United States.

1.　　 Look, the light in the bedroom is still on. Mr Black ___ be at home.

4.　　 The things in the museum were ___ ago.

A.　 several hundreds years　 B. several hundred years

B.　 several hundreds years　 D. several hundred year