My father lost ____keys. Now he can’t get into the house, the office or the garage (车库).
#27998
A
a pair of
B
a piece of
C
a cup of
D
a set of
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—I have a ______. What should I do?—You should see a dentist.
#27713
A
stomachache
B
backache
C
toothache
D
headache
The work is too hard, so ____ were needed. 
#28339
A
another six men
B
six men more
C
more six men
D
men another six
David visited lots of        in the world.
#28736
A
places of interesting
B
places of interest
C
place of interests
D
place of interesting