Nobody knows the answer _______ this question.[ ]

Is Mr. Green in the office?—No, he ________ be in the office. Look, the light in the office is off.

How do you say 15,858? —.

What’s the time by your watch, Linda?– Sorry, I don’t know. I ___________ my watch at home.

Mr Brown _______ the train station _______ three o’ clock in the afternoon .