Sir, would you mind not _____ here, please?
A．to smoke B．smoke C．smoking D．smoked
Miss Green isn’t in the office. She_______ to the library.
A．went B．was C．has gone D．has been
I didn’t hear your call because I ______ to music at that time.
A．listen B．will listen C．am listening D．was listening
My parents often______ me some gifts on my birthday.
A．buy B．will buy C．buys D．has bought
— Must we get to the airport before 8 o’clock?
— No, you _____. The plane takes off at 12 o’clock.
A．mustn’t B．needn’t C．wouldn’t D．shouldn’t
Which is ____________, the telephone, the computer or the light bulb?
A．useful B．more useful C．most useful D．the most useful
