Teachers’ job is ______ the students learn well.
—Is your brother at home?—No. He ________ the library. He hasn’t come back yet.
Don’t worry. He ________ you as soon as he gets home.
The boy has a cold and the doctor asks him ________ more water.
—Oh, you look tired. Why?—I ________ to the Great Wall yesterday. It was really wonderful.
Ben is one of ________ students in our class. He keeps doing sports every day.