II. 单项选择（20分）
( )21．The number of ________ in our class ________ fifty.
A. student, is B. the students, are C. the students, is D. students, are
( )22. __________ is too difficult if you put your effort into it.
A. Anything B. Something C. Nothing D. Everything
( )23. This morning Jack came to school __________ than ________ student in his class.
A. much late; any B. much late; any other
C. much later; any D. much later; any other
( )24.---When were the workers born? ----About _________ of the workers in the factory were born in the_________ .
A. two-thirds; 1970 B.two-thirds; 1970s C. two-third; 1970 D. two-thirds; 1970
