20. You ______ be tired. You have only been working for an hour.

A. must not　　 　 B. won’t　　　　 　　　　 C. can’t　　　 　　 D. may not

19. If you want to change for a double room you'll have to pay_______$15.

A. another　　　 　 B. other　　　　 　　　　　 C. more　　　 　　 D. each

18. Stand over there 　　　　you’ll be able to see it better .

A. or　　　　　 　 B. while　　　　 　　　　　 C. but　　　　 　　 D. and

17. Losing weight is no easy task. A lot of people who lost weight gain it back over time and end up back ______ they started.

A. where 　　 　　　 B. though　　　 　　 　　　　　　　 C. since　 　　　 　　 D. after

16. -You shouldn’t have played such a joke on him.

-Sorry. I ______ that he would get so angry.

A. didn’t expect　　 　　　　　　　 　　　　 B. don’t expect

C. hadn’t expected　　　　 　　　 　　　　　　　　 D. hasn’t expected