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Complete the following sentences with " needn't have done " or " didn't need to do ". 1. We had to stop at the frontier but we_______________(open) our cases. 2. The sun came out so we_____________(take) any rainwear on the trip. 3. A: I had my carpet cleaned yesterday. It was very expensive. B: But you __________(have) it cleaned. You could have cleaned it yourself. 4. When I got home from the bakery, I found we still had plenty of bread, so I __________(buy) a loaf.