It is the test system, _______ the teachers, that is to blame for the heavy burden of middle school students nowadays.
I feel sure I _____ her before somewhere.
You’ll never guess who I met today — my old teacher! We _____ for 20 years.
I _____ your last point — could you say it again?
They won’t buy any new clothes because they _____ money to buy a new car.
I left my pen on the desk and now it’s gone; who _____ it?