You may lead the horse to the river, but you _____ make it drink.
| A．couldn’t | B．can’t |
| C．mustn’t | D．needn’t |
We didn’t start our discussion __________ everybody arrived.
| A．since | B．if | C．while | D．until |
Take the exam carefully, _______ you won’t get full marks.
| A．but | B．and | C．or | D．so |
We hope that with the help of the new skill, Liu Xiang can run ________than before.
| A．fast | B．faster | C．fastest | D．the fastest |
The students from Xinjiang enjoy staying in our school because everyone is ____ to them..
| A．friendly | B．gently | C．happily | D．politely |
The old man used to raise many ________ to make a living on the farm.
| A．duck | B．horse | C．bird | D．sheep |