1. Most of the choices appear to be          ones that you are familier with, but after taking

             second look, you will find that they are different.

      A. /; the                B. the; the                           C. the; a                          D. /; a

2. Now the air in our city is _______ than it used to be. Something must be done to stop it.

A. very good     B. much better                         C. rather bad            D. even worse

3. ---Did you return Helen’s call?   ---I didn’t need to _________I’ll see her tomorrow£®

    A£®though       B£®unless                    C£®when              D£®because