Don't talk, don't tell your mother, the police office is on fire... This seems like a pretty sketchy module.
And why am I only seeing these in the strengthening exercises?
Why is "Mae'r swyddfa heddlu ar dan" not accepted here? The correct answer was given as "Mae swyddfa'r heddlu ar dan"
I gave that as an answer too. The only reason I can think of for it to be marked 'wrong' is that it isn't right. You just have to tuck it away in your memory banks.