Past perfect and simple past

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I couldn’t go to the cinema with my friends last night because I (finish / not) my homework yet.

I couldn’t go to the cinema with my friends last night because I had not finished my homework yet.

When we ___(come) back, it was cold in the house because Alice (close / not) the windows.

When we came back, it was cold in the house because Alice had not closed the windows.

We ___ (eat) at a restaurant last night because I (buy / not) anything for dinner.

We ate at a restaurant last night because I had not bought anything for dinner.

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