二、单项填空（共18小题；每小题1分，满分18分）
21. — My daughter has passed the exam.
—Congratulations! She’s really intelligent.
— .
A. No, she is nothing B. Oh, thank you!
C. Sometimes she is intelligent D. You are right
22. you understand this rule, you’ll have no further difficulty.
A. Until B. Unless C. Though D. Once
23. A number of students ____ seen the film. That is，the number of the students who have seen the film____ large.
A. have; is B. has；are
C. has; is D. have； are
24. ---Any news about the fire?
--- ________ of the people _______ from the burning building by now.
A. Two third; were rescued B. Two thirds; has been rescued
