Doctors tell people _________ their hands often and to stay home if they feel ill.
| A．to wash | B．washes |
| C．wash | D．washing |
After a long hiking, the boy was ________ tired to walk.
| A．too | B．to | C．so | D．very |
— There are still many old city walls in Xi’an, _______?
—Yes, there are.
| A．are there | B．aren’t there |
| C．are they | D．aren’t they |
—Whose purple coat is this?
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
| A．must; may | B．may; must |
| C．can’t; may | D．mustn’t; must |
—Our country is becoming _______.
—Yes. We all love it.
| A．stronger and stronger | B．more and more strong |
| C．the strong; the strong | D．strongest and strongest |
—Look, Victor. This brown cat is ________ than that white one.
—Yes. And it is _____ of all these cats.
| A．big; big | B．bigger; bigger |
| C．bigger; big | D．bigger; the biggest |