Remains to be ___ (is not yet known)

• "I've ___ better days"
• "Nobody knows the trouble I've ___"
• "I've --- the light!"
• Gazed upon
• No longer hidden
• Called, in poker
• "Have You Ever --- the Rain?"
• (Had) noticed

WordNet Word definitions in WordNet
v. perceive by sight or have the power to perceive by sight; "You have to be a good observer to see all the details"; "Can you see the bird in that tree?"; "He is blind--he cannot see" perceive (an idea or situation) mentally; "Now I see!"; "I just can't ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Seen \Seen\ (s[=e]n), p. p. of See .