用所给词的适当形式填空。（8分）  

1. Lin Fei's home is about 10_______ (kilometer) from school.  

2. The bus _______ (take) about 25_______ ( minute)．  

3. Walking must be a lot _______ (many) fun than taking a bus.  

4. He often _______ (ride) to school, but sometimes he _______ (walk) to school.  

5. I'm not happy with the way of _______ (work).  

6.A number of _______ (boy)  ride their bikes to school.