Complete die second sentence so that it has a similar meaning to the first

Sure! Here are the completed sentences with similar meanings:

1. I'm sorry that I don't know what to do about the problem. → I wish I knew what to do about the problem.
2. Linda wrote her composition hours and hours ago. → It's hours since Linda wrote her composition.
3. When I was a child, we lived in Bristol. → We used to live in Bristol when I was a child.
4. She's sorry she can't play the piano. → She wishes she could play the piano.
5. I don't normally have coffee for breakfast. → I am not used to having coffee for breakfast.
6. It was breakfast time when Susan rang. → I was having breakfast when Susan rang.
7. My mother spent three hours making a dress. → It took my mother three hours to make a dress.
8. Reading newspapers in the morning gives him pleasure. → He enjoys reading newspapers in the morning.
9. You can make payments at any post office. → Payment can be made at any post office.
10. In the middle of our sleep there was a knock at the door. → When we were in the middle of our sleep, there was a knock at the door.