1. More than 1 million people in southern California and northern Mexico were without electricity after _______ major power failure struck just before _______ afternoon rush ho ur.

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

2. If not _______, you’re allowed to return everything within 10 days for a full refund and no further duties.

3.     —Have you finished the book?

 —NO. I've read up to _______ the children discover the secret cave.

 A. where                  B. what                      C. that                       D. which        

4.   In recent years, India and China ______ a growing middle class.

   A . saw                     B. would see            C. had seen              D. have seen   

5.   Lifelong musicians are less _______ to experience age-related hearing problems than non-mus icians, according to a new Canadian study.

   A. possible            B. possibly               C. probably              D. likely      

6. —What do they sell?

     —Clothes, furniture, books, — _______, they sell it!