Read the following paragraph and underline the topic sentences.
We are living in an electronic age. We are awakened by electric alarm clocks and music pouring from our radio: we operate our toaster, brush our teeth with an electric toothbrush.and shave with an electric razor. We read the day 's headlines from newspapers printed on huge electric presses, and we write a letter on our electric typewriter before leaving for work to operate a computer and word processor.