You ________ worry about their safety．They are old enough to take care of themselves．

1. A.
   mustn't
2. B.
   needn't
3. C.
   can't
4. D.
   wouldn't

You ______ worry about their safety．They are old enough to take care of themselves.

    A．mustn’t  B．needn’t     C．can’t  D．wouldn’t

You ______ worry about their safety．They are old enough to take care of themselves.

     A．mustn’t    B．needn’t         C．can’t        D．wouldn’t

You ______ worry about their safety．They are old enough to take care of themselves.