Another cup of coffee? That’s your third since lunch.—Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.

Mary and I see each other ________，but not as often as we used to.

The Chinese Vice-President Xi Jinping _______ visit the United States on Feb 13 on a three-country tour.

The medicine won’t cure the disease — it ________stops the pain

Was it 11 o’clock ________ your father came back last night?—Yes, he is always coming back so late