20. Sometimes the sea is so rough that the island is _____ from the mainland for weeks at a time.　 　　

　 A. cut off　　　　　　 B. cut down　　　　　　　 C. cut out　　　　　　　　　 D. cut up

19.---Excuse me. Is this the right way to the zoo?

　 ---Sorry. I am not sure. But it _____ be.

　 A. will　　　　　　　　　 B. must　　　　　　 C. can 　　　　　　　 D. might

18. Women in Iran are _____ to go out without a Veil(面罩).

　 A. allowing　　　　　　 B. not allowed　　　　　 C. prevented　　　　　　 D. stopped

17.－ Will you lend me some paper?

－ Sorry, mine________.

A．is running out of　　　 　 B．has been run out　

C．has run out　　　　　　　 D．has run out of