Academy stars 5 Unit 1 Grammar 2

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We heard a crash. We were studying in the library. (while)

While we were studying in the library, we heard a crash.

We heard a crash. We were studying in the library. (when)

We were studying in the library when we heard a crash.

We were doing a science experiment. We heard the fire alarm. (when)

We were doing a science experiment when we heard the fire alarm.

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