___Mr Chen is waiting outside to speak to you. He appears to be quite ___ important person.
| A．/. an | B．A, an | C．The, the | D．The, / |
—Will you go to the park now?
—Not until I ________ my physics exercises.
| A．will finish | B．have finished |
| C．will have finished | D．had finished |
Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words.
| A．has just left | B．had just left | C．just left | D．was just leaving |
—Does Liu Hui serve in the army?
—No, but he ________ in the army for three years.
| A．served | B．has served | C．is serving | D．would serve |
I feel sure I ________ her somewhere before.
| A．was to meet | B．have met | C．had met | D．would meet |
—Are you a teacher?
—I ________, but now I am working in a company.
| A．is | B．am | C．was | D．had |