He began to take political science__________ only when he left school.
Children________in public very often.
—— What happened to the young trees we planted? —— The trees______well, but I didn’t water them.
The traffic light is red, so I______stop my car.
—— Shall I tell John about it? —— No, you____. I don’t know his telephone number.
—— May I leave the office before 5 o’clock in the afternoon? —— No, I’m afraid you_______.