把下列句子变成被动词态。
1. Do they teach Japanese in their school?    
    ______________________________________________________
2. We heard her sing in the room.    
    ______________________________________________________
3. Will they eat a special dinner at the restaurant?    
    ______________________________________________________
4. He hasn't finished his homework yet.    
    ______________________________________________________
5. He gave me a very nice present for my birthday.    
    ______________________________________________________
6. Can we make jiaozi at school?    
    ______________________________________________________
7. Must we finish the work now?    
    ______________________________________________________
8. Linda looks after the kid at home.    
    ______________________________________________________
9. He found nobody in.    
    ______________________________________________________
l0. They saw a lot of students playing basketball on the playground.    
    ______________________________________________________

He hasn't finished his homework _____.