---Look at the boy running on the playground. Is it David?
---It ________ be him. I saw him go to the teachers’ office just now.
| A．mustn’t | B．can’t |
| C．couldn’t | D．must |
There _______ a pen on the desk. It is a black pen.
| A．are | B．is | C．am | D．be |
—Mum, my teacher, Mr. Wang. — Nice to meet you, Mr. Wang.
| A．he is |
| B．it is |
| C． this is |
| D．that is |
—John, what’s this _______ English? — It’s a computer.
| A．at | B．of | C．for | D．in |
This is ___ map and that is ____ orange.
| A．a, a | B． a, an | C．an, a | D．an, an |
---The blue pen is mine. ________ this dictionary?
---It’s hers.
| A．What color is | B．What’s |
| C．Who is | D．What about |