---May I take this book out ? --- No, you _____ .
A. can’t B. may not
C. needn’t D. aren’t
He’s worked there since the shop opened in 1998, _____ ?
A. isn’t he B. hasn’t he
C. doesn’t he D. wasn’t he
She will have a holiday as soon as she _____ the work next week.
A. finished B. will finish
C. finish D. finishes
The world _____ . Things never stay the same.
A. had changed B. is changing
C. was changing D. will change
Could you tell me when to get the book _____ I want to read?
A. what B. who C. / D. it
The math problem is so hard. I really don’t know _____.
A. what to do it B. how to do
C. how to do it D. what do it
