Had they invested in new technology, their products wouldn’t have become outdated., They didn’t invest in new technology. Their products became outdated., Had she followed the instructions, she wouldn’t have made a big mistake., She didn’t follow the instructions. She made a big mistake., Had we left early, we wouldn’t have missed the flight., We didn’t leave early. We missed the flight., Should you need a refund, you must keep the receipt., If you need a refund, you must keep the receipt., Should you visit London, you should see the Tower of London, If you visit London, you should see the Tower of London

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