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