1．The students were studying in _____ classroom when, all of____ sudden, the lights went out.
A．the; a B．不填; a C．a; a D．a; the
2．John didn’t choose____ of the ties and went away without looking at a third one.
A．any B．neither C．either D．none
3．—I’m sorry, but I don’t quite follow you. Did you say you wanted to return on September 20 ?
—Sorry, I myself clear. We want to return on October20.
A．hadn’t made B.wouldn’t make C．don’t make D．haven’t made
