At the opening_ _of the school, our headmaster gave a short speech.
By the time he was twelve, Edison __________ to make a living by himself.
As its name indicates, the “American Host Family” program gets American families __________in foreign students' lives in America and offers homes for them.
A lot of tall buildings __________ in Shanghai in the past three years.
John's success has nothing to do with good luck. It is his hard work __________ has made him what he is today.
I have a lot of books, half of __________ novels.