相关题目
The working conditions in the factory have been greatly （ ）. Now it is very comfortable to work there.
Little Johnny did something bad and his mommy sent him to his own room to （ ）on his misbehavior.
Oil is （ ）to remove naturally occuring impurities.
To conserve natural resources, we have to （ ）all reusable waste materials.
I had such a bad cough that the doctor （ ）that I take a few days off.
After the devastating earthquake, the small town has undergone such a tremendous transformation that I can hardly（ ） it.
Dogs bark at strangers because they can （ ）the smell of their masters.
Jim knows about birds well. He can（ ） the songs of most birds.
Once they （ ）their mistake, they stopped the machine and re-checked it.
Students should （ ）their hands before asking questions in class.
