in, on, at

I don't like to study _____ home. It's too noisy.

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Last summer we stayed in a cabin _____ a lake.

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My office is _____ the 20th floor, so I take the lift.

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I like to listen to music when I'm _____ the gym.

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• in

There are important Roman ruins _____ Jordan.

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They're planning to go to Australia ____ Christmas.

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• in

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If you want to exercise, do it first thing ____ the morning.

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• on

• in

I often have to work ____ the weekends.

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She goes to visit her parents every year ____ August.

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My friend Peter and I speak ____ the third Thursday of every month.

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