Help me plz!!!

Correct the sentences:
1. They lives in London.
2. Have they never watched this film?
3. What did you do while I was cleaning my room?
4. My credit card is empty. If I have a lot of money,I will buy a sport car.
5. What is bigger country in the world?
6. He spends too many money on clothes.
7. If it will rain,we take a taxi.
8. Sam always must do the washing up after dinner.
9. This gadget is invented last year.
10. There wasn't some homework to do yesterday.
11. Why is Felix so happy? - He passed his exam.
12. This exit isn't enough big for two people.
13. I've tryed parachuting but I didn't like it.
14. I think people don't might buy CDs in the future.
15. Is there a lot of children in the park?
16.

1. They live in London.2. Have they ever watched this film?3. What were you doing while I was cleaning my room?4. My credit card is empty. If I had a lot of money, I would buy a sport car.5. What is the biggest country in the world?6. He spends too much money on clothes.7. If it rains, we will take a taxi.8. Sam must always do the washing up after dinner.9. This gadget was invented last year.10. There wasn't any homework to do yesterday.11. Why is Felix so happy? - He has passed his exam.12. This exit isn't big enough for two people.13. I've tried parachuting but I didn't like it.14. I think people might not buy CDs in the future.15. Are there a lot of children in the park?