Ex.5 Допишите предложения

He ___ (run) for an hour before he stopped.

They ___ (talk) for ages before she left.

She ___ (cook) all morning when guests came.

I ___ (look) for my keys for an hour.

It ___ (snow) for two days.

We ___ (travel) for ten hours.

They ___ (not / sleep) well.

He ___ (study) before the lights went out.

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