Years ago we didn't know this, but recent science study ________that people who don't sleep well soon get ill.
#100471
A
showed
B
will show
C
has shown
D
is showing
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30. Because of the heavy snow, a serious accident______to the family.
#103312
A
occurred
B
happened
C
was happened
D
took place
The thief______ when he was stealing a wallet from a woman. 
#104328
A
happenedtonotice
B
wastakenplacetonotice
C
washappenedtobenoticed
D
happenedtobenoticed
. –Hi, Bob, don’t you know me? --Oh, it’s you. I _____you.
#103815
A
didn’t recognize
B
don’t recognize
C
haven’t recognize
D
won’t recognize