Computers are of great        to the development of science and technology.

In part of China, some people still have difficulty gaining       to social services.

I shouldn’t have accepted the man’s present, but I found it difficult to turn down his ______.

.In our ______,anyone ______ breaks the law should be punished.

If you don't know that _________ is the mother of success, your are sure to be ________ in life.