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1. Another man-made satellite was sent up into space by them last week. (變主動語態(tài)) 
                                           another man-made satellite into space last week.
2. People there planted many trees last year. (變被動語態(tài)) 
   Trees                           by people there last year.
3. They grow vegetables on the farm. (變被動語態(tài)) 
    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.