单项填空
21、In our class, when the bell rang and the teacher closed his book, it was a____ for everyone to stand up
A. signal B. chance C. mark D. measure
22、In_______ most countries, a university degree can give you ____flying start in life.
A. the; a B .the; / C. /;/ D. /; a
23、–Which one can I take?
-You can take ____of them; I’ll keep none.
A. all B. any C. both D. either
24、- What’s the model plane look like?
- The wings of the plane are ____of its body.
A. more than twice the length B. twice more than the length
C. more than the length twice D. more twice than the length
