Why do you call him Mr. Knowledgeable—Because he knows almost everything we want to know.

Listen! Someone__________ in the next room.

I don’t knowwhat I _______ without the suitcase you lent me.—Glad to havebeen of some help to you.

He has _______ for two years.. Two years _______ a long time.

Could you tell me ________—Yes， it will start at ten.