-- It’s a pity that you missed the lecture on nuclear pollution. -- I _________ it, but I was busy preparing for a job interview.
—Will you go to the park now? —Not until I ________ my physics exercises.
Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words.
—Does Liu Hui serve in the army? —No, but he ________ in the army for three years.
I feel sure I ________ her somewhere before.
—Are you a teacher? —I ________, but now I am working in a company.