779.Doctors say that exercise is important for health,but it ____ be reguolar exercise.
A.can
B.will
C.must
D.may
780.Just be patient.You ____ expect the world to change so soon.
A.can't
B.needn't
C.may not
D.whether
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779.Doctors say that exercise is important for health,but it ____ be reguolar exercise.
A.can
B.will
C.must
D.may
780.Just be patient.You ____ expect the world to change so soon.
A.can't
B.needn't
C.may not
D.whether