课时作业(二十一) [必修5 Unit 1 Great scientists] (限时:35分钟)Ⅰ.单项填空________ for their son's bad performance at school.
A.are to blame
B.is to be blamed
C.are to be blamed
D.is to blame
2.The workers will go on strike if the demands they ________ are turned down.
A.put aside
B.put through
C.put forward
D.put away
3.[2012·辽宁卷] Rod loves ________ clocks. However, he never manages to put them together again.nly after he had spent several nights working on the maths problem ________to
wonder whether the problem was wrongly set.
A.he began
B.that he began
C.he did begin
D.did he begin
5.My brother is shy,so it is a great ________________ to difficult situations are better at handling those ________ tasks.
A.exposing; challenging
B.exposed; challengedchallenging
D.exposing; challenged________ of the disease,90 patients have been confirmed to have the illness and another 35 suspected patients are still under examination. unlucky________.
A.to be rejected
B.to have been rejected
C.being rejected
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