simple past und past perfect - negative sentences

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. Note that you will lose points if you ask for hints!
1. She (not / work) very hard because she (not / feel) well the week before.
2. He (wait) for his sister because he (not / read) her text message.
3. She (not / call) him back because he (not / leave) a message on her answering machine.
4. We (not / raise) a lot of money so we (not / be) able to buy an expensive present for his birthday.
5. We (not / change) money before we (go) on holiday.
6. She (not / go) to the gymnasium yesterday because she (not / finish) her work yet.
7. The waiter (bring) an apple juice that we (not / order).
8. I (meet) a friend who I (not / see) for a very long time.
9. We (eat) at a restaurant yesterday because my mother (not / buy) anything for dinner.
10. I (not / read) the book, so I (not / understand) the movie.
11. My sister (never / be) to a musical before last Saturday.
12. Her teacher (notice) that she (not / do) her homework properly.
13. They (not / be) to Cologne before 2011.
14. Mr Smith (not / order) anything again at M&C's after they (send) him a broken vase.
15. We (not / have) breakfast, so we (eat) a sandwich in town.