He _____ English for ten years by the time he takes the examination.
Though I have no idea _______ the new film is about, I know it is popular with all who have seen it.
They desired that they_______ the right to vote.
The professor explained this theory so clearly that this phenomenon was easy enough ________.
—Mike, our team will play against the Rockets this weekend. I am sure we will win. —_________.
He has devoted himself __ mankind. to benefit B. benefiting C. to benefiting D. benefited