Tom is good a student he is often praised by the teacher.
Tom said that he was late because he ________ in the elevator.
His parents told him ________ too much about what others said.
________ his appearance, he is most probably a new teacher.
After teaching in Bejing for five years, he returned to the small town ________ he grew up as a child.
He devoted all his life to ________ those who are suffering from cancer.