______ is _____ the students to find out the meaning and the usage of new words.

1. A.
   What a dictionary does; help
2. B.
   What dictionary does; to help
3. C.
   How a dictionary does; help
4. D.
   All that a dictionary does; helps

______ is _____ the students to find out the meaning and the usage of new words.

A. What a dictionary does; help   B. What dictionary does; to help

C. How a dictionary does; help   D. All that a dictionary does; helps