At first sight, it ________ look like a generous offer; actually, it is a trick.

1. A.
   may
2. B.
   must
3. C.
   shall
4. D.
   should

At first driving requires a lot of concentration, but over time, it just becomes_____.

   A.authentic    B. available    C. automatic     D. awake 

At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tell him something.

　　A. crossed    B. passed    C. occurred    D. opened

At first he hated the new job but decided to give himself a few months to see ___ it got any better.   

A. when    B. how    C. why    D. if  

At first the institute refused to purchase the telescope, but this decision was _____ revised.

   A. occasionally    B. consequently

   C. successively    D. subsequently.