The smoke alarm was beeping, so I changed its battery.

Meaning: This sentence is saying that the smoke alarm was making a sound, so I replaced the battery inside it.

Choice of Words: The smoke alarm is a device that makes a loud sound to warn people of a fire. When it beeps, it means there might be a fire, so you should take action. Changed means to replace something with something else. Battery is a small device that provides power to the smoke alarm.

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