---The window is dirty.----I know. It ______ for weeks.
#101155
A
hasn’t cleaned
B
didn’t clean
C
wasn’t cleaned
D
hasn’t been cleaned
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I would have come sooner but I ________ that they were waiting. 
#104791
A
haven’t known
B
hadn’t known
C
don’t know
D
didn’t know
— I’m sorry, I thought the remark would amuse you.— It _____.
#104978
A
wouldn’t
B
won’t
C
doesn’t
D
hadn’t
Although she is pretending hard to be young, grey hair and the lines on her face _______.
#100643
A
give her away
B
pick her up
C
take her away
D
hold her up