—I’m sorry to keep you waiting.—Oh, not at all, I______ here only a few minutes.

George has arrived, but I did not know he ______ until yesterday.

Keep it in mind not to disturb the president at two o’clock this afternoon, when he ____ a global joint meeting. 

---- Why have you bought so much food ? ----My good friends ________ to stay with me for the weekend.

When the old man _______ to walk back to his house, the sun ________ itself behind the mountain.