1. --- Did you hear someone knocking at the door just now?
--- No,sir. I music.
A. was listening to B. listened to
C. am listening to D. would listen to
2. --- Why didn't Mary see me wave(挥手)to her?
--- She in the other direction.
A. looked B. has looked C. was looking D. is looking
3. --- Lisa, I called you just now. Where were you?
--- Sorry, I a shower.
A. take B. am taking C. was taking
