1. They often clean their classroom after school . (改为被动语态)    
    Their classroom _____ often _____ by them after school.   
2. Li Lei gave Tom a new pen last week . (同上)    
    A new pen _____ _____ _____ Tom last week .   
3. A lot of people in China can speak English now . (同上)    
    English ______ ____ ______ by a lot of people in China now.   
4. I have learned English for about two years. (同上)    
    English _____ _____ _____ for about two years.   
5. They will publish these story-books next month. (同上)    
    These story-books _____ _____ _____ next month.

1. Another man-made satellite was sent up into space by them last week. (变主动语态) 
                                           another man-made satellite into space last week.
2. People there planted many trees last year. (变被动语态) 
   Trees                           by people there last year.
3. They grow vegetables on the farm. (变被动语态) 
    The vegetables                           on the farm.
4. Must the old people                            (speak) to politely?
5. English                           (speak) in many countries, but the Chinese              (speak) their own language.