Ответ:

1. Julia had a great holiday. She enjoyed herself.

2. It's not my fault. You can't blame me.

3. What I did was really bad. I'm angry with myself.

4. We've got a problem. I hope you can help us.

5. Can I take another biscuit?' 'Of course. Help yourself.

6. You must meet Sarah. I'll introduce you to her.

7. Don't worry about us. We can think about ourselves.