—What ____ cold weather!
—Yes, But it’s ____ unusual experience for us. We normally live in a hot place.
| A．/; a | B．a; an |
| C．/; an | D．a; the |
Ask John ______ here at 7 pm tomorrow.
| A．come | B．coming | C．came | D．to come |
The air in Beijing is getting much ______ now than a few years ago.
| A．clean | B．cleaner | C．cleanest | D．the cleanest |
He has two pets. One is a dog, ______ is a cat.
| A．the other | B．other | C．others | D．another |
— Will you stay for lunch?
— Sorry, I ______. My brother is coming to see me.
| A．needn’t | B．can’t | C．shouldn’t | D．mustn’ t |
I phoned you at six yesterday evening, ______ nobody answered.
| A．because | B．or | C．but | D．so |