The little child ____go out alone at night, so he ____walk in the dark that night.
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 _______.