---Is Lucy ______ her homework?--- No , she ________ .
#39513
A
do; doesn’t
B
does; isn’t
C
doing; is
D
doing; isn’t
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I ________my homework while my parents _________TV last night.
#41821
A
did; have watched
B
was doing; were watching
C
had done; were watching
D
would do ;were watching
These boxes ______ for keeping the food clean and cool.
#39501
A
use
B
are used
C
have used
D
were using