The reason for his success is ______ he worked very hard.
I remembered my grandma _________ me stories when I was a little child.
If I take this medicine twice a day, it should _______ my cold.
The children ran away from the orchard(果园)________ they saw the guard.
In China, the education is divided into three _______: basic education, higher education and adult education.
By the time he was twelve, Edison _______ to make a living by himself.