Would you please turn the light ___ because it's dark?

His parents，_________，did not look after him very well—the elbows of his jacket were patched and his boots were badly worn.

－Have you been to Liuyang?  －No, I'd like to, _______. 

--- It is what parents say and do that really matters in children’s character training. --- ___________.

He began to take political science ________ only when he left school.