We must study hard, because we shouldn’t _______ our parents _______ .
#59521
A
make; down
B
let; up
C
help; happy
D
let; down
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Although they were tired, they still went on _____. 
#56410
A
working
B
to work
C
work
D
worked
 The film         for half an hour.
#53968
A
has begun
B
has been on
C
hasn’t begun
D
began
You can ________ in a parking lot.
#59022
A
eat meals
B
mail things
C
park your car
D
buy things