用括号内所给单词的适当形式填空。
1.He has been _________(die)for two years. We still miss him.
2.He wants to go to college for further _________ (educate)after he graduates from high school.
3.The whole class had a good __________ (discuss)before the field trip.
4.The light bulb is one of the greatest _________ (invent)in the world.
5.Jack went back to his seat without _________ (reply)to the teacher’s questions.