21. We have come to ______ conclusion that the company has been making ___ great progress these months.
A. the; / B. the; a C. a; a D. /; a
22. Mum ____ my suggestion while Dad spoke ____ of my idea.
A. turned off; in favor of B. turned down; in favor of
C. turned down; in need of D. turned on; in hope of
23. —What are on show in the museum?
—Some pictures ____ by middle-school students.
A. taking B. having been taken C. taken D. being taken
