单项选择题
A. He lost a button at work. B. He doesn’t know where he put the calculator. C. He thinks he broke something the woman lent him. D. He’s not sure how to solve the math problem.
A. it makes us sleepy B. it causes sleep loss C. it increases our appetite D. it results from lack of sleep
A. It will be finished on time, B. It is only open during the day. C. Something has happened to the building. D. The workers are about to complete it.