More N1 vocabulary

• 確保かくほguarantee; ensure; maintain; insure; secure
• 悪戯いたずらtease; prank; trick; practical joke; mischief
• 耕作こうさくcultivation; farming
• 色々いろいろvarious
• 権力けんりょくpower; authority; influence
• いっそrather; sooner; might as well