Mr. Black is strongly _____ keeping animals in the zoo, because he thinks animals should also have the right to enjoy freedom.

Look! A book is on the floor. Whose is it—It ______ be Rick’s. It has his name on it.

Excuse me, does Mr. Zhang’s son live here —He________ be here, but he has moved

Did Ann fail in English?—She ____. Don’t you notice that she looks depressed?

Rosa _____ this washing machine for more than ten years. She is thinking about buying a new one.