£¨   £©1. The boys were talking when I ____ some cleaning.

         A. do      B.  did     C. to  do     D.  doing

£¨    £©2. My uncle gave me a model plane yesterday. It’s a structure of_______.

       A. S+V+P     B. S+V+IO+DO  

C. S+V+DO+OC  D. S+V+DO

£¨    £©3. Wolves will          their lives______ the loss of the trees and forest.

A. lose, because of        B. lose, because 

C. loss, because of   D. loss, because

£¨    £©4. -Where were you both at this time last night?

     -Tom was writing an e-mail ______I was watching TV at home.

         A. as soon as       B. after           C. until      D. while