Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

What would you like_____dinner?[ ]

We can’t go out ________________ school nights.[ ]

You seem familiar with Mr. John?-Of course, we_______ together for three years in the 1990s.

A: Listen! Is it Tina singing in the next room?B: No, it __________ be her. She is still in Shanghai.