To____ an entry visa is very difficult now.

To____ an entry visa is very difficult now.
A. appeal for
B. apply for
C. apply in
D. appeal in
      满分：2  分
2.  I am sorry____________ written you a letter at the time.
A. to have not
B. to not have
C. not to have
D. not having
      满分：2  分
3.  The problem of housing____________ lead to the problem of social instability.
A. itself
B. must
C. did
D. never
      满分：2  分
4.  Your shirt needs____________ . You'd better have it done today.
A. iron
B. to iron
C. ironing
D. being ironed
      满分：2  分