A. are not          
B. is not      
C. not are

A. is            
B. are          
C. am

1. Mrs Zhang            (be) a driver twenty years ago.
2. Liu Hai is our teacher.  He            (teach) English.
3. —Was your grandpa a teacher? 
    —Yes, he was. He      ___ (teach) Chinese.
4. I           (read) a book at home yesterday.
5. Chen Hai            (study) art very hard five years ago.
6. Her mother             (walk) to work the day before yesterday.

A. are            
B. is                
C. can

1. Here _____ (be) your library card
2. I want _____ (buy) a new computer.
3. You can _____ (find) out the answer to the question.
4. Where _____ (be) the book about animals?  .
5. They are going to make a big hamburger in two _____ (day) time.

A. does    
B. is
C. are

A. is
B. Is
C. Am

A. Do; for      
B. Are; for      
C. Did; to

A. are
B. is
C. /
D. be

A. are
B. is
C. am