---- Who(谁) are they?---- __________.
My teacher used to _______ a bike to school, but now he is used to ________ a car to work.
When he saw the poor conditions in the school, he decided to ______ some teaching instruments for them.
The flight to New York was ________ because of the heavy fog.
—What did you talk about just now?—My father asked me ___________.
______ you say sorry to your uncle, he won’t forgive you.