"title": HTML5 Crossword

Across

1. demanding and challenging (9,0)
4. an impact or mark left behind (9,0)
6. at risk of extinction (10,0)
7. on the condition that (8,0)
9. resolute and persistent (10,0)
11. full of excitement and energy (12,0)
12. certain to happen (10,0)
13. environments where animals or plants live (8,0)
15. extraordinary or outstanding (11,0)
18. becoming very wet (7,0)
19. difficult and tiring (7,0)

Down

2. motivating and uplifting (9,0)
3. someone who sees the best in things (8,0)
5. involving multiple countries (13,0)
8. not probable or expected (8,0)
9. a disadvantage or inconvenience (8,0)
10. exceptional or remarkable (11,0)
14. demanding and thorough (8,0)
16. center of attention or concentration (5,0)
17. if not (6,0)