Can you correct these sentences so that they sound more natural + using “used to”? 2. People used to think that having three or four-inch feet looked respectable and more attractive to men. That's why women used to bind their feet to make them smaller. 3. People used to think that using hard drugs (such as heroin or morphine) could cure coughing 4. People used to take post-mortem photos to preserve the memory of loved ones who had passed away 5. Men used to challenge each other to a duel to settle disputes, reclaim their honor and preserve their reputations. 6. People used to send their children through the mail to save money because it was cheaper than buying a train ticket 7. People used to consider blackened teeth as a symbol of beauty in women 8. Women used to wear cone masks to protect their fragile faces from winter conditions and they liked them so much that they used to wear them in the summer months too. 9. Our ancestors used to be convinced that adding radioactive ingredients like radium and thorium to beauty products (like toothpaste and lipstick) was a good way to enhance beauty products, food, and drinks. 10. People used to hire knocker-uppers (human alarms) to wake them early. Knocker-uppers used long sticks or peashooters to tap on people's windows.