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Ответ:

Ex. 1

1. How much did you pay for that painting?

2. I did not pay anything. It was a present.

3. When we arrived at the cinema, our friends were waiting for us.

4. My grandfather found a valuable manuscript while he was working in his attic.

5. He sold it to the museum for more than half a million dollars.

Ex. 2

1. What kind of music did you use to listen to when you were a child?

2. I used to listen to pop music. I did not use to like classical music then, but I do now.