Jumping out of _______ train running at a speed of 200 kilometers per hour is quite _____ dangerous practice.
_____ the chapter four times, I finally understood the author's theory.
Ann ______ here any more.She left last month.
You really need to go out and get some fresh air and sunshine.You ______ overworked during the last two weeks.
Mike seldom asks ______ questions in class, but today he raised ______ fairly good one.
---They live on a busy road. --- There ______ be a lot of noise from the traffic.