2.1

1. abridge
2. acquiesce
3. allude
4. constitute
5. contrive
6. corroborate
7. culminate
8. depreciate
9. dilate
10. discriminate
11. arid
12. chronic
13. dubious
14. indulgent
15. internal
16. lethal
17. livid
18. overt
19. senile
20. virtual