4. A lot of young men have volunteered …………….. social activities.

in                    at                          for                        about

5. Our neighbor always shows ………………….

sociably          sociability             society                           social

6. It is funny to tell ……………..

joke                 jokes           joking          joker

7. Our parents always behave …………………… toward us.

generously                         generosity             generous               generally

8. They helped those street children …………………..

volunteers                          voluntary              volunteer              voluntarily

9. Our students are ……………………

straighten                 straightness           straightly              straight-forward

10. That boy has short ……………. hair.

curl                           curly                     curling                  curls

11. He is a natural ………………. His hair is pale gold in color.

Man                          blond                    blonde                            color

12. Generosity is part of the Vietnamese ………………….

character                   characterize          characterful          characteristic

13. She has long ……………….. hair.

fairly                        fair                       curl                       fairness

14. A home for children whose parents are dead is an …………………

orphan                      orphanage             organ                    organize

15. He is unwilling to show his feelings. He is ………………..

reserve                      reserved                reserving                        to reserve

16. I …………… a letter from my old friend last week.

sent                          gave                      received                took