Give the correct forms of the words in the brackets:
1. .............................., men used to wear the Ao dai. (tradition)
2. Nobdy likes your .................................. . You should change character. (friend)
3. It was an ............... day with Kien when he failed the exam. (happy)
4. Easter is a ........................ festival. (joy)
5. Newton was one of the greatest ............... in the world. (invent)