Tom was ______ that he couldn’t understand ______ difficult sentence.
| A.so a stupid boy; such | B.a so stupid boy; a such | 
| C.so stupid a boy; a such | D.so stupid a boy; such a | 
Don’t worry. I’m sure you’ll succeed _______ if you work hard.
| A.on time | B.in time | C.at times | D.ahead of time | 
Many rules in English are ______, and large numbers of students feel ______ them.
| A.puzzled; puzzled with | B.puzzling; puzzled about | 
| C.puzzled; puzzling with | D.puzzling; puzzling about | 
He had to have the washing machine _________ last night.
| A.to mend | B.mending | C.mended | D.being mended | 
You________ drink it, for it is poisonous.
| A.can’t | B.needn’t | C.may not | D.mustn’t | 
They made a bet _____the white horse.
| A.for | B.with | C.on | D.in |