He was afraid what he had done ______ a disastrous effect on his career.a. might have b. could be c. have been d. shall be
His boss is going to be on vacation next week and the company will be left _______ him.
Both of his parents insisted that he _______ get on well with his lessons and that he ______ given more extra classes at weekends.
She was educated at Beijing University, _______ she went on to have her advanced study abroad.
He is the only one of the students who _______ a winner of scholarship(奖学金) for three years.
Healthy diet should ________ some nutrition (营养素), ________ sugar, protein and calcium.