Had I mastered the statistic technique, a large amount of time and, energy .
Not until____ did Humphrey begin working.
21st Century, ____weekly newspaper, provides us with____variety of fresh articles about campus studies and life.
His first book ______ next month is based on a true story of his family.
People who are ______ modern city life may think it is rather dull to live in the countryside.
Many Chinese college graduates leave their country to get further education in America with the ______of getting better jobs in the future.