He arrived home very late last night, __________in the early hours this morning.
He didn't answer, with his gun __________ at David.
Teachers are now aware of the difficulty that some students have __________ attention.
—I made it at last. I am on top of the world! — __________
Liu Xiang trained hard before the Asian Games in Guangzhou, and it __________. He won the gold medal in 110 meters' hurdles.
I can't __________ to lose the papers because they contain a lot of confidential information.