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The longer people ( are living / lived / live ), the more health problems they develop.

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( Fewer / Fewer and fewer / The fewer ) adults live with their parents now. More of them lived with their parents before.

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The stricter their parents are, ( the more rebellious / more and more rebellious / more rebellious ) the children become.

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The older I ( am getting / get / got ) the less I understand teenagers.

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When my father was young, there was much more emphasis on rules and ( obedient / obedience ) than there is today.

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In the past, young adults were expected to be far more ( independent / independence ) than they are today.

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Every ( capable / capability ) young man was expected to contribute part of his salary to the family.

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Parents’ rules for sons were often more ( lenient / lenience ) than their rules for daughters.

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There were lower ( expects / expectations ) for women in the workplace.

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I think I left my purse on the train. I’ll call the lost-and-found; someone may have turned it in.

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Jim had to have been at the office this morning. His computer was turned on, and there was a hot coffee on his desk.

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The bright light in the sky last night might have been from a plane. I think it’s possible, even though I didn’t hear any loud noises.

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The stones used to build the Egyptian pyramids must have been difficult to move.

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The Incas didn’t have any sophisticated machines or work animals. The temples ( must / couldn’t / may ) have been built exclusively by human hands.

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Dinosaurs may not have died off gradually as the result of climate change. They ( had to / could / would ) have been killed off quickly by some sudden event.

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I don’t believe in any of those other crazy theories. Stonehenge ( might have been / were / had to have been ) built by ancient Britons many years ago.

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The Nazca lines are incredible, but I’m certain they weren’t created by people who lived 1,500 years ago. The ancient people ( couldn’t have / would have / must have ) had the knowledge to create something so accurate.

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Conspiracy fans continue to consider the story of Roswell aliens. They believe that UFOs ( might / couldn’t / had to ) have crashed in the desert.

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It’s obvious that something terrible happened. The crew ( had to have / would have / might ) abandoned the ship during the incident. There’s no other explanation.