If chips ____ ____ in our bodies at birth, it ____ ____ more difficult to steal our identities. If genetic engineering ____ ____, our food ____ ____ much ____. If human cloning ____ ____, we ____ ____ doubles walking around If the airplane ____ ____ ____ in the early 1900s, we ____ not ____ ____ the opportunity to see so much of the world. If dinosaurs ____ ____ ____ extinct, the world ____ not ____ ____ to where we are today. If written language ____ not ____ ____ thousands of years ago, people ____ ____ had to rely on oral communication. If electricity ____ ____ ____ in the seventeenth century, other related discoveries ____ not ____ been ____.

Passive Voice in Unreal Conditional Sentence

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