Choose the word (A, B, C or D) that best fits the blank space in the following passage:
By using computers people can do things faster (1)_______by using other means. Computers can do any calculations more than a skilled mathematician. If a computer is programmed properly, it can work accurately. When we look back the history of computer (2)_______, we can see the great differences (3)_______the computers and the modern ones. The old computers work much slower than the modern ones. We can use the new generation of computers conveniently (4)_________ their small size and many applied programs which are widely used all over the world. We can get any sorts of information from the Internet. These are the reasons (5)________ computers appear not only at offices but also at home.
