—He asked her_________the bag because it was too expensive．

——Now lots of teenagers spend a lot of time playing computer games. ——Yes. Teachers and their parents should prevent them ______________ too much.

The man went into the room, _____ rather strange. 

—Why did you plant so many trees? — ______ the environment.

Before I started high school, I used to spend a lot of time _____ games with my friends.