Can you think of a case ________ this idiom can be used?If you can’t, I will get another student ________ it．

1. A.
   how; do
2. B.
   how; to do
3. C.
   where; do
4. D.
   where; to do

Can you think of a case ___________ this idiom can be used?  If you can’t, I will get another student _________ it.

   A. how; do     B. how; to do      C. where; do          D. where; to do