Science has bought many changes to the world today. It is used in all corners of the world (1) _______ the benefit of man. The motorcar or electric lamp that we use was not known to people who lived a few generations ago. Thanks to science, we are now (2) _______ to do many things (3) _______ ease and comfort. Travel has become very easy. Science has also been used in medicine. As a (4) _______, people can now live longer than their ancestors could. Even the (5) _______ serious diseases do not frighten people so much as they did before.