She_the door again for fear .
A. examined
B. exanining
C. exam
D. examintation
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_ is high time you,lent her a hand.
A. it
B. that
C. this
D. what
Even if he were here himself he should not what to do.
A. 对
B. 错
Nobaby could save him even though huatuo should come here.
A. 对
B. 错
According _some studies half of the sevice jobs pay low wages.
A. to
B. for
C. on
D. in