Its improved ____ give the car more speed and better gas mileage. As with whales and dolphins they use ____ when exploring the surrounding environment. In England, during the middle ages, adults would tell village children stories about ____ who attack children that wander too close to the forests. Petroleum has a negative ____ on the environment. Having more than one wife is bigamy; having more than one husband is pure ____. The fall in the number of deaths from heart disease is generally ____ to improvements in diet. You can't just ____ on your parents lending you the money. You ought to get some antibiotics for that ear ____.

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