People should _____ from throwing the rubbish everywhere .
| A．be stopped | B．stopped | C．stop | D．stopping |
A set of keys ____ in the library. Are they yours?
| A．is | B．am | C．are | D．aren’t |
— Where _______your books? — _______ in the bookcase
| A．is , It’s | B．is, They’re |
| C．are, it’s | D．are, They’re |
— Does David have a ping-pong ball?
—________. But he has some tennis balls.
| A．Yes, he does | B．No, he doesn't |
| C．No, he isn't | D．Yes, he is |
.Hi,Linda. This _____ my sister and those ______ my brothers.
| A．is, is | B．is, are | C．are, is | D．are, are |
_____ your brother_____ baseball?
| A．Do; have | B．Do; has |
| C．Does; has | D．Does; have |