This is not an economical way to get more water；________ it is very expensive．

1. A.
   worse still
2. B.
   on the contrary
3. C.
   in short
4. D.
   in addition

This is not an economical way to get more water；       ，it is very expensive．

A．rather than                                        B．on the other hand

C．in a word                                         D．on the contrary