Fill in the gaps with the right forms of verbs in the brackets. 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.