He is _____ careless a student that he often _____ some letters while writing.

1. A.
   such; leaves on
2. B.
   so; leaves off
3. C.
   so; leaves out
4. D.
   such; leaves out

He is _____ careless a student that he often _____ some letters while writing.

He is _____ careless a student that he often _____ some letters while writing.

 He is _____ careless a student that he often _____ some letters while writing.

He is _____ careless a student that he often _____ some letters while writing.