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聽下面對話，選擇正確的答案。
(     ) 1. A. Once a week.     
            B. Twice a week.     
            C. Three times a week.
(     ) 2. A. He has a stomachache.   
            B. He has a sore throat.   
            C. He has a cold.
(     ) 3. A. He is going camping.     
            B. He is babysitting his sister.  
            C. He is doing his homework.
(     ) 4. A. By bike.            
            B. By bus.            
            C. By car.
(     ) 5. A. Paul.                  
            B. Paul's brother.      
           C. Paul's sister.
(     ) 6. A. One.                  
            B. Two.                
            C. Three.
(     ) 7. A. He went to the zoo.      
            B. He went to the movies.  
           C. He went to the aquarium.
(     ) 8. A. 7.                   
            B. 8.                  
            C. 17.
(     ) 9. A. In 1999.      
            B. In 1998.      
            C. In 1997.

We do homework three or four ______ a week.      

—How often do you go hiking?
—______.

— ______ do you go to visit the museum?
— ______.