—What does your father do?—He is ________ English teacher at _________ university.
Don’t leave your books on the table.Please _______.
---If there are _______ people driving, there will be _______ air pollution. ---Yes, the air will be fresher.
While I _______ down the street, I _______ my classmates.
If it _______ tomorrow morning,we’ll go out for a picnic.
--- _______ I come back before 6 o’clock? ---No,you _______.But you _______ be back later than 7 o’clock.