________ you are aware of the trick used in advertisements, I don't think you are eager to buy．

1. A.
   Unless
2. B.
   Whether
3. C.
   Once
4. D.
   Although

          you are aware of the trick used in advertisements ,I don’t think you are eager to buy.

1. A.
   Whether
2. B.
   Until
3. C.
   Though
4. D.
   Once

_____you are aware of the trick used in advertisements, I don't think you are eager to buy.

A. Unless   B. Whether  C. Once D. Although

          you are aware of the trick used in advertisements ,I don’t think you are eager to buy.