Pet raisers should look after their pets carefully, _______ they won’t be allowed to keep them any longer.
| A．so | B．or | C．and | D．but |
---Is this your ruler?
---No, it isn’t. It’s ________.
| A．he’s | B．her | C．his | D．she |
I have ________ aunt and ________ uncle.
| A．a; an | B．a; a | C．an; a | D．an; an |
---Are these your books?
--- Yes, ________.
| A．I am | B．these are | C．they are | D．you are |
Thank you ________ your e-mail.
| A．of | B．at | C．for | D．in |
The boy is ________ the room.
| A．on | B．in | C．at | D．under |