1)
swamp
vast
storytaller
skyscraper
hemisphere
2)
1. chain 2. mixture 3. great-grandparents 4. measure 5. trust 6. sandy
3)
1. he was slipping, was cleaning
2. travelled
3. had risen
4. had entered, began
5. finished
6. had done
7. He didn't like
8. had ended, reached
9. was, was working
10. built
4)b 50