We (a) _____ (live) in the era of science now. We are doing a lot of things that (b) _____ (be) unimaginable in the past. Science (c) _____ (deliver) many wonders. The invention of electricity (d) _____ (revolutionize) our life. Radio, television, refrigerators, lights, fans all run with the power of electricity. We (e) _____ ('think' in the negative) of our existence without it.