—Listen! Is Mary singing in the next room?
—No. It _______ be Mary．She has gone to Shanghai for an important meeting.
| A．can’t | B．may not | C．mustn’t | D．needn’t |
Have you got anything __________?
A．play B．to play C．playing
Tell her _____________ the radio.
A．turn down B．turning down C．to turn down
I feel it useful _________English.
A．to learn B．learn C．learning
I prefer ________his new idea.
A．try out B．to try out C．trying out
He wanted _________ an inventor .
A．to be B．being C．is