People have planted a lot of trees and grass in order to ____ wind and sand in the desert.

 _______air pollution getting worse, the government needs to come up with some effective measures to deal with it. 

Nowadays many new couples like to ____ their wedding photos and hang them on the wall.

---It’s hard for me to go to sleep. ---Try to ______the amount of coffee you drink during the day.

As a senior high student, you should 　　your energy on how to master the skills of learning.