Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
#62205
A
shall
B
must
C
may
D
will
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- Look, Sue is over there.- That ____ be her. She is in Canada now.
#78119
A
mustn’t
B
can’t
C
needn’t
D
won’t
—Miss Li, must we hand in our homework right now?—No, you ____.You can hand it in tomorrow.
#77809
A
don’t
B
mustn’t
C
needn’t
D
may not