Choose the best answer 1. He has been very interested in doing research on ............... since he was at high school A. biology B. biological C . biologist D. biologically 2. You are old enough to take ..................... for what you have done A. responsible B. responsibility C. responsibly D. irresponsible 3. Many Vietnamese people ..................... their lives for the revolutionary A. sacrifice B. sacrificed C. sacrificial D. sacrificially 4. They had a ........................... candle lit dinner last night and she accepted his proposal of marriage A. romance B. romantic C. romantically D. romanticize 5. She spent me a ................................. letter thanking me for my invitation A. polite B. politely C. politeness D. impoliteness 6. As an .............................. , Mr.Pike is very worried about the increasing of juvenile delinquency A. educate B. education C. educator D. educative