—The light in the office is still on.—Oh, I forgot_________________.
It's rude __________ you to ask his salary the first time you __________ him.
We should consider the students' request __________ the school library provide more books on popular science.
—How much do you know about the 3D film technology? _ A little. Not until the hot movie Avatar __________ some about it.
Some of you may have finished unit one. __________ you can go on to unit two.
He observed a stranger __________ around the store at midnight. A, wandering B. to wander C. wander D. to be wandering