My mouth was watering________I watched the TV program A Bite of China.
| A．when | B．before | C．since | D．after |
She_______ to an English program while her parents________TV.
| A．was listening；is watching | B．listened；were watching |
| C．was listening；watched | D．was listening；were watching |
—What were you doing when we were dancing yesterday afternoon?
—I_______ the classroom.
| A．was cleaning | B．have cleaned | C．will clean | D．clean |
Little Tom_________ computer games when his father got home.
| A．is playing | B．plays | C．was playing | D．played |
Mr.Black ________ working although it is mid-night.
| A．stopped | B．continued | C．forgot | D．enjoyed |