3. My cousin spends half an hour going to school on foot.(问乂句转换) 

It  my cousin thirty minutes    school.

2. I'm doing my homework now.(同义句转换)

     now?

1. There is only one carton of milk in the fridge.(同义句转换)

    of milk  there in the fridge.

10. If you take more exercise,you   (feel) better.

9. Who   (raise) cows on the farm next year? Mary?s   father is.

8. The children had fun. (row) boats on the lake yesterday.

7. I can hear my neighbor   (sing) in the next room now.

6. It is so cloudy. I think it   (rain) .

5. We made the volunteers   (check) our computers last week.

4. Why not   (lie) on the grass to have a rest?