Turn these sentences into the opposite form

IV. Turn these sentences into the opposite form. (active or passive)
1)    The house was built over one hundred years ago.    
    
2)    People don’t use this road very often.    
    
3)    We haven’t used the machine for ages.    
    
4)    The new drug is being tested.        
    
5)    How do people learn languages?        
    
6)    This factory will produce 10.000 cars next year.    
    
7)    Somebody has cleaned the room.        
    
8)    They cancelled all flights because of fog.    
    
9)    Bill is using the computer at the moment.    
    
10)    When did they decorate your kitchen?