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I’m impressed with his determination. When he had a problem to solve, he  _____ work at it until he found an answer.
#63610
A
would
B
might
C
must
D
should
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My sister met him at the street yesterday afternoon, so he __________ your lecture.
#63077
A
shouldn’t have attended
B
couldn’t have attended
C
mustn’t have attended
D
needn’t have attended
If you         smoke, please go outside.
#62183
A
can
B
should
C
must
D
may
—_______ do you clean your room?— Every day.
#77537
A
How long
B
How many
C
How often
D
How soon
-1 hear you've got a set of valuable coins.___________ I have a look?-Yes, certainly.
#62559
A
Will
B
May
C
Shall
D
Should
 The red bike _______be Hu’s. She has a blue bike.
#78305
A
must
B
might
C
can
D
can’t