——Now lots of teenagers spend a lot of time playing computer games. ——Yes. Teachers and their parents should prevent them ______________ too much.
–Can you go shopping with me tomorrow?--_____. But I have a lot of work to do.
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.