lead:fllow:_________:interest
graceful:clumsy:enlivening;___________
happy:glad:confident:____________
It seems you need to study one of these "how to solve analogies" websites:
http://www.google.com/search?aq=0&oq=how+to+solve+analo&sourceid=chrome&ie=UTF-8&q=how+to+solve+analogies
You also need to make good use of a thesaurus: http://www.thesaurus.com
Let us know what you discover.