To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
—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.
I ________ your last point — could you say it again?
They won’t buy any new clothes because they ________ money to buy a new car.