1.Without permission, you won't have access to the library's facilities.
2.It is said that medical care can't replace a well-balanced diet.
3.There is no need for you to waste time complaining about your past failure.
4.Whether he will obtain the scholarship the first year he enters the university still remains a question.
5.Not until the late twentieth century did the Chinese athletes begin to amaze the world with their excellent performance at the Olympics.