Complete the sentences with the correct form of the words in brackets.
1. Without good education, the _____ (develop) of the economy and technology would be impossible.
2. The lecture was very _____ (inform) and I really enjoyed it.
3. My friends are very creative and likes to _____ (invention) new machines.
4. I’m afraid the _____(communicate) between different departments hasn’t been very good recently.
5.I think I’ll buy him Scrabble or some other _____(educate) game.
6. What do you think is the most important _____(discover) ever made?