(   )28.-_____ you put away your books?-Yes, mum. I’ll do it at once.
#76655
A
Might
B
Should
C
Could
D
Must
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--- May we leave the classroom now? --- No, you ____________ . You ____________ to leave before the bell rings.
#78161
A
mustn’t, are allowed
B
don’t have to, are allowed
C
needn’t, aren’t allowed
D
can’t, aren’t allowed
Even a drop of water ______because it is so important to all the living things.
#76903
A
must waste
B
must be wasted
C
mustn’t waste
D
mustn’t be wasted