secret; secrecy; mystery; secret (e.g. to success); esoteric teachings
unusual; rare; new; novel; fine (e.g. gift)
I've heard that ...; rumour has it that ...; it appears as if ...
to keep (something) a secret; to keep hidden (for ever); to continue to conceal
don't you think?; indicates question
to get complicated; to grow worse; to turn sour
adds force or indicates command
certain; sure; doubtless; I have no doubt; You can depend on it; It's a safe bet