—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
--- I’m afraid I have to give it up.--- Remember _____ sticks to his work will succeed one day.
It is only when you get close to the National Entrance Exam _______fully realize how much time you have wasted.
Chang’e Satellite is named after a famous Chinese fairy , who is said ______to the moon.
The article suggests that when a person _______ under unusual stress he should be especially careful to have a well-balanced diet.
A group of young Americans have come to Beijing for a visit. Half of them, ___is, 50 persons, can speak Chinese fluently.