— Study hard, ________you won’t be able to pass the exam.

   —I’ll,mum.  

A. and                  B. or                   C. so

I must study hard ________ I won't fall behind others.

1. A.
   in order to not
2. B.
   so as not to
3. C.
   in order not to
4. D.
   in order that

--- Study hard, ________you won’t be able to pass the exam.
--- I’ll,mum

1. A.
   and
2. B.
   or
3. C.
   so

— Study hard, ________you won’t be able to pass the exam.
—I’ll,mum.  
A. and                 B. or               C. so