20. -Mr. Smith, I wonder if I could take Friday off?

　　　 -　　　 ? It’s a bit difficult with so many people away on holiday, you know.

　　　 A．How come 　　　　　　　　　　　　　　　　　　　　 B．Is it necessary

　　　 C．Where are you going　　　　　　　　　　　　　　 D．Do you really have to

19. After five days’ climbing in the mountain, they reached ____ they thought was the place they’d been dreaming of.

A. that　　　　 B. where　　　　 C. which　　　　 D. what

18. I’m moving to the countryside because the air there is much fresher than ____ in the city.

　 A. ones　　　　　 B. one　　　　 C. that　　　　 D. those

17. --- Can I call for some friends and spend the day outside with them, Mom?

　 --- ____ I’ve told you to have a weekend on your own.

　 A. Why so?　　　 　　　　　　B. Why not?　　　

C. How come?　　　　　　　 D. So what?

16. --- I hear Robert has gone to Harvard University for his master’s degree.

--- Oh, how nice! Do you know when he ____?

A. was leaving　　　 B. left　　　　 C. had left　　 D. has left