.He suddenly saw what looked like a snake in the darkness. For an instant his heart seemed to stop ______.
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A
to beat
B
beating
C
beaten
D
being beaten
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Though______money, his parents managed to send him to university
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A
lacked
B
lacking of
C
lacking
D
lacked in
 As the mid- examination is coming , the students are busy ____ it.
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A
preparing
B
prepare for
C
prepare
D
prepareing for