Red is often _______ celebrations in China.
| A．used to | B．use to |
| C．used for | D．use for |
—________ I smoke here?
—No. You are not allowed to smoke in public places.
| A．Could | B．Must | C．May | D．Might |
It is very important for us ________ English well.
| A．learn | B．learning | C．to learn | D．learned |
Hurry up, _________ you will be late for class.
| A．and | B．or | C．but | D．so |
John is standing ________ Gina and Jim.
| A．at | B．during | C．between | D．in |
He didn’t go to school yesterday _______ he was ill.
| A．because | B．because of | C．if | D．so |