Tell John not to leave the house unless he _________ that the lights_________.
—Have you ever seen two leaves that are exactly the same? —Never. Leaves differ ____ each other ____ size and shape.
The only system I know ____ will help you remember what you have heard at a lecture is the system of keeping notes.
What difficulty will you have ____ people when you stay in a foreign country?
_____ I always felt I would pass this monthly exam, I never thought I would get an A. A. While B. Once C. As D. Because
The doctor will see you again next week. ____, you must rest as much as possible.