Modern civilization is the a of science. Science has worked b a magician in the world. We can't do even a c day without the help of science. Many quick means d communication like telephone, telex, fax, telegram, satellite etc. are e greatest wonders of science. Nowadays, a message can be sent from one corner of the world to another in the twinkle of f eye. Science has brought a revolutionary g in all fields. In the field of medical science, h has got eyes, lame has got legs, deaf has got hearing power, i diseases which were incurable in the past are now easily j.