keen on, for, to, in or about?

  • But I was not keen on the idea.
  • Yes, I'd keen for a cycle ride.
  • We are keen to back such people.
  • She's not that keen in some ways.

"key to", "key for" or "key in"?

  • J KEY to attack, K KEY to jump.
  • Timing is key in every respect.
  • Prevention is key for the kids.
  • Planning is key at home and at work.

"knowledgeable about" or "knowledgeable in"?

  • He appeared very knowledgeable about the Bible.
  • He was very knowledgeable in the Qur'an.
  • Be knowledgeable of instrument symbols.
  • Be knowledgeable on the subject.