----Oh, you painted the walls yourself? ----Yes. It was not hard. The whole work didn’t ______.
The reason _______ he raised for being late with the exercise was ______he had to send his mother to school.
It is said _________ was how Chinese characters developed.
The coin was almost worthless. So it was of small ________.
She had hardly got back to the kitchen ________ the doorbell rang.
They discovered the cause of the fire accidentally. They discovered it _______.