While in college, Mak never minded ________ extra work for his class.
#53027
A
to do
B
doing
C
do
D
did
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Most of _____ fly to the south when winter _______ .
#54547
A
they , comes
B
them , come
C
them , comes
D
them , came
I should go to see a dentist because I ________.
#54782
A
have a cold
B
have a toothache
C
have a sore back
D
have a fever