1. The number of students of this school ____greatly in the last few years.
A. is increasing B. has increased
C. are increasing D. have increased
2. Most of the movies directed by Zhang Yimou ________historical facts.
A. is based on B. based on C. are based on D. basing on
3. ---- Why do you look sad?
---- There are so many problems_________.
A. remaining to settle B. remained settling
C. remaining to be settled D. remained to be settled
