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11. existence
12. grateful 
13. longevity
14. satisfied
15. nationally
6. skillfully
7. careless 
8. collector
9. friendly/ friend
10. difficulties

VI/
1. That exercise is not as easy as this one.
2. It took us two hours to write this letter.
3. I have played this game for 2 years.
4. The weather is so cold that we can't go out.
5. The film is not interesting enough for us to see.
6. The weather is too cold for them to go out for dinner. 
7. This is the first time I have eaten the food like this.
8. In spite of being warned not to climb that tree, they did./ In spite of my warning, they climbed that tree.
9. Unless you look after those shoes, they won't last for long.
10. Harry still lives in England, doesn't he?
11. This film is not as good as the film I saw last week.

11. existence
12. grateful 
13. longevity
14. satisfied
15. nationally
6. skillfully
7. careless 
8. collector
9. friendly/friend
10. difficulties

VI/
1. That exercise is not as easy as this one.
2. It took us two hours to write this letter.
3. I have played this game for 2 years.
4. The weather is so cold that we can't go out.
5. The film is not interesting enough for us to see.
6. The weather is too cold for them to go out for dinner. 
7. This is the first time I have eaten food like this.
8. In spite of being warned not to climb that tree, they did./ In spite of my warning, they climbed that tree.
9. Unless you look after those shoes, they won't last for long.
10. Harry still lives in England, doesn't he?
11. This film is not as good as the film I saw last week.