—It is said that John’s paper got an A. —He deserves it. He _________ a lot before he handed it in. A. prepared B. prepares C. had prepared D. has prepared
Mr. Green __________ for more than ten years.
By the time he was twelve, Edison __________ to make a living by himself.
I can’t tell you _____ way to the Wilsons’ because we don’t have _____ Wilson here in the village.
Many websites have been _______ to help people study foreign languages.
Although I have studied Chinese for nearly two years, I still have some difficulty _______ myself.