单项选择题

Water ______ be changed into gas, but it ______ be heated to its boiling point.

A．must; can
B．may; needn"t
C．can; must
D．need; may
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单项选择题
—Would you like me to go to the dentist with you—No, you ______ with me.
A．need not to go
B．need not go
C．do not need go
D．not need go
单项选择题
At the last place Gary worked, they ______ an annual company picnic. All the employees ______ bring their families along and spend the day at a nearby park. It was great.
A．had to have; had to
B．used to have; couldn"t
C．would have; didn"t have to
D．used to have; would
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