Mr. Smith went to a bookstore, where a lot of books were        .
#4588
A
produced
B
invented
C
housed
D
disappeared
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We must keep our room clean, for dirt and disease go______, you know.
#4919
A
hand in hand
B
step by step
C
from time ti time
D
one zfter another
He must have attended the meeting yesterday, ___he?
#4556
A
didn’t
B
mustn’t
C
needn’t
D
hadn’t