James has just arrived, but I didn’t know he _______ until yesterday.
—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
My sister, an inexperienced rider, was found sitting on the bicycle __________ to balance it.
We came home after our holiday only __________ our pet dog injured.