He used to __ in a small village, but now he has been used to __ in the big city.
My mother is busy_____ the room.
The harder we work, the_____ result we will get.
–The classroom is_____ clean_____ it was yesterday.--Sorry, I forgot to clean it.
Every day the boss makes him_____ 12 hours.
— the help of Tian Sheng Yi Dui, many children have new school buses.—It sounds great.