In face of      failure, it is the most important to keep up         good state of mind.

1. A.
   不填, a
2. B.
   a, 不填
3. C.
   the, a
4. D.
   不填, the

In face of ___ failure, it is the most important to keep up ___  good state of mind.

     A./, a    B.a. /     C.the, /     D./, the 

In face of     failure, it is the most important to keep up        good state of mind.

In face of      failure, it is the most important to keep up         good state of mind.

In face of     failure, it is the most important to keep up        good state of mind.

A．不填, a           B．a, 不填           C．the, a             D．不填, the