I'm getting this in the plural lesson?
It is here to test your recognition of and distinction between singular and plural forms. This might be what is called a 'trick question'.
this one got me too. keeping us "on our toes" - English idiom for being alert
I' spanish. I don't know when you have to use "man" or "men"
Why does it looks like it's saying Tamten "da" mężczyzna in the fast audio?
I'm afraid I don't hear any additional syllable.
why is it Tamten?
Well, that's just the word for "That". The masculine singular (so the basic one in the dictionaries) version.