21. Who do you think will take
_____ office next month and become _____president of the country?
A.不填；不填
B. a; 不填
C. the; a
D. the; the
22. Either you or one of your students_____ to attend the meeting_____ tomorrow.
A. is; to be held
B. are; having held
C. is; being held
D. are; to be held
