Mr. Smith gradually _____ a knowledge of the subject.
I am not familiar________these new words,but I will learn them________heart soon.
Our country is developing at an amazing speed,which is________makes me feel so proud.
What annoyed your father was not what you said,but the way________you said it.
You________scold such a pupil who always keeps silent so seriously that you________hurt him.
The train moved slowly from the station,but________speed as it reached the open country.