Your article must be sent by e-mail _________ it can meet the deadline．

1. A.
   or else
2. B.
   so that
3. C.
   in case
4. D.
   until

Your article must be sent by e-mail          it can meet the deadline．

A．or else            B．so that              C．in case                 D．for fear

 Your article must be sent by e-mail _______ it can meet the deadline．

       A．or else                B．for fear that        C．in case              D．so that