The policeman came up to the house, whose door was open, _____ there for a while, and went in.
#100895
A
to stand
B
standing
C
stood
D
stand
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As the supermark_______, allthe goods are sold at half price.
#104887
A
has closed down
B
is closing down
C
closed down
D
had closed down
----Have you got your test result?    ----Not yet. The papers _____.
#100928
A
are still being corrected  
B
are not correcting
C
have already been corrected  
D
have not corrected
It’s only six o’clock now; Little Tom should be up ,though, because he _____ for nine hours.
#102920
A
has been sleeping
B
had been sleeping
C
has slept
D
had slept