I'm amazed at how awkward this one is for me with that missing apostrophe. It's not just grammatical nitpicking, that little mark has a significant meaning, and I can't immediately see the "correct" answer in the set of words I've been given, even when I understand the Russian sentence.
In Russia we have an expression from a Soviet cartoon "В стране невыученных уроков" ("In the country of unlearned lessons"): Казнить нельзя помиловать! literal translation: execute not pardon. Казнить нельзя, помиловать! v Казнить, нельзя помиловать! (You can’t execute, have mercy! v Execute, no mercy!)
Finkie Baby - on the contrary it is you & Theron who are missing the point entirely. People of course make their complaints to the duolingo team - but also want to express their thoughts & feelings & observations to other users in a comradely manner as well as venting their frustration at the sometimes complete lack of any timely or appropriate response to irritating errors of grammar & context. To excoriate enthusiastic learners for the understandable activity of social interaction & comment amongst each other about the good the bad & the ugly of duolingo reveals a caste of mind that is both inappropriate & condescending & perhaps you as a seasoned & senior long term user of this fundamentally excellent but sometimes flawed language learning system should employ your influence with the powers that be in support of all users who ultimately fund the operation with rather more sympathy than the somewhat peremptory disdain you appear to project. Toodle Pip me Old China!
Katie - as with most of the others in this string - is correct. The apostrophe is required because it signifies the genetive or possession 'the money of my students' - regardless of whether it sounds awkward or not. True it's not idiomatic and would be regarded as quaint or awkward - but is correct and references to whom the money belongs. Principal problem with duolingo is that it is a software program written by Americans who of course think they speak English - which sadly is very far from reality!
Please don't tar all Americans with the same brush. Some of us are quite literate. (And I feel obliged to note that the notion that any one version of English is 'better' or 'worse' than another is simply not correct. They have merely evolved in different directions and will likely eventually become distinct languages from a common root, as the Romance languages have evolved from Latin.)
The answers in the incubator are correct, report a bug: https://support.duolingo.com/hc/en-us/requests/new
The apostrophe is there and has always been there. If you're not seeing it, report a bug: https://support.duolingo.com/hc/en-us/requests/new
The way the Swedish Duolingo seems to solve the apostrophe question with the word bank type answers is to have a little square with an 's or an s' to put in after the word, rather than having the entire noun with an s on the end. So there is apparently some method within the DL formalism to achieve a solution to this apparently insurmountable problem!
The answers we have entered are correct. All we can do at this point is report the bug until Duo fixes it.