Pilihlah kata yang tepat untuk melengkapi kalimat-kalimat di bawah ini!

1. We both had (difference/differ/different) ideas.
2. Sammy has a lot of (confidence/confident/conference).
3. Improve your (communal/communication/communicate) skill.
4. She was so (jealousy/jealous/jeal).
5. Your participation will (affect/effect/defect) your grades.
6. He is now (officially/official/offily) the King of Prom.
7. Football's our country's (national/nationality/nationwide) sport.
8. Our opinions often (differentiate/differ/different).
9. We all attended Kate's (graduation/graduate/gradual) ceremony.
10. We must (continuous/continuity/continue) to boost our sales performance.