Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
The old clock needs every day, otherwise it will stop working.
—I feel so nervous about the coming college entrance examination. —________. You have been studying very hard.
Our teacher requested all of us _________ late for class.
We ____________ here on time. But the traffic was so heavy.
The Internet was flooded with a game called the Ice Bucket Challenge(冰桶挑战), ________ raise people’s awareness of a disease named ALS.