21.A. while B. as C. when D. until
19.He left without a word as if .
A. never to return B. never returning
C. he had never returned D. he would never returning
18.-What do you know about the new plan?
- I know every detail about it. , I know it.
A. Therefore B. Or rather C. Nameiy D. That is
17.We decided not to climb the mountains because it was raining .
A. badly B. hardly C. strongly D. heavily
16.-He failed again.
-The of too much time to computer games leaves too little time for studying.
A. use B. cost C. devotion D. expense
15.I don’t understand how you got a ticket. I always you a careful driver.
A. think; are B. am thinking C. thought; were D. think; were
14.It’s often less expensive to buy goods in quantity, but you’d better examine quality before buying them.
A. / ; the B. the; / C. a; the D. the; the
13.They can’t be quarrelling now, they?
A. can B. may C. are D. will
12.- one and a half days enough for the painting to be finished?
-I don’t think it’s enough and only after go on with it.
A. can B. may C. are D. will
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