Question 8.
1. useful (a)
2. invention (n)
3. communication (n)
4. variety (n)
5. entertainment (n)
6. limitations (danh từ số nhiều)
7. surfing (V-ing)
8. development (n)
9. impressed (a)
10. friendship (n)
11. compulsory (a)
12. tropical (a)
13. religion (n)
14. fashionable (a)
15. traditional (a)
16. wonderful (a)
17. equal (a)
18. national (a)
19. interest (n) - suitable (a)
20. spoken (P2) - necessary (a)
