— The air pollution is terrible.
— It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．when |
—The museum isn’t far from here. Why not go there by _______?
—OK. And it’s good for our health.
A B C D
It’s reported that a terrible rainstorm hit _______ south of our country.
| A．a | B．the | C．/ | D．an |
–Whose shirt is this?
--It _______ be Li Lei’s. It is too big for him.
| A．could | B．must | C．can’t | D．might |
I saw many ____________ eating grass on the hill.
| A．horse | B．cow | C．rabbit | D．sheep |
—By the way, have you got ______ e-mail address?
—Oh, yes, it is swimonland @ hotmail.com.
| A．a | B．an | C．the | D．/ |