A. am             
B. was             
C. is

A. am       
B. are        
C. is          
D. was

[     ]

A. am           
B. is                
C. was                
D. are

[     ]

A. am, is               
B. be, is              
C. was, was     
D. am, was

(     ) 1. A. What is it?
　　　  B. What day is it?
　　　  C. What time is it?
(     ) 2. A. What did you do?
　　　  B. What do you do?
　　　  C. How did you do?
(     ) 3. A. I am happy today.
　　　  B. I was happy yesterday.
　　　  C. I wasn't happy yesterday.
(     ) 4. A. I talked to many clerks.
　　　  B. I walked to many stores.
　　　  C. I like stamps.
(     ) 5. A. What are you doing?
　　　  B. Where are you living?
　　　  C. What are you writing?