21.—Who is Ms Chen?
—My new English teacher at _____ senior high school, who has _____ different teaching method from others.
A. the; a B./;the C. a; a D./;a
22. She became so _____ as the interview continued that she didn’t know what to say.
A. nervous B. organized C. serious D. amazed
23. Tony, you are late again. I’m afraid you will be fired _____ you change your attitude to work.
A．until B．since C．unless D．when
