--Can I play computer now?  --No, you ______. You _____do your homework first.
#76207
A
can; can
B
can’t; must
C
can’t; can
D
must; can
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Those who failed to get into the art exhibition ________ disappointed as many of the artists who should have appeared did not come. 
#63148
A
didn’t need feel
B
needn’t have felt
C
mustn’t have felt
D
couldn’t have felt
You ______ to the party if you’re so busy.
#76821
A
don’t need come
B
not need coming
C
needn’t come
D
need not to come
The river smells terrible. People_______ dirty things into it .
#63313
A
must stop to throw
B
must stop from throwing
C
must be stopped to throw
D
must be stopped from throwing
We _______the letter yesterday, but it didn”t arrive.
#63105
A
must receive
B
ought to receive
C
must have received
D
ought to have received