Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom.
It is thein this country to go out and pick flowers on the first day of the spring.
Michael be a policeman, for he is much too short.
The teacher apologized late.
Smoking is a bad habit.You should it.
He left the key ______ he had been an hour before.