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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－Shall we go hiking this Sunday? －Sorry, I _______. I’ll have to take a piano lesson.
#74286
A
may not
B
can’t
C
needn’t
D
mustn’t
Looking after very young children _____ be very annoying sometimes, but you’ll get used to it after a while.
#62887
A
must
B
should
C
shall
D
can
—Can I go to the park, Mum?—Certainly. But you ______ be back by six o’clock.
#76284
A
can
B
may
C
might
D
must