I got this exercise as a dictation/pronunciation exercise. All the pronunciation links (except one of them) provided by enbrs sound the б in хлеб a something much closer to English "p" than English "b" - and that's the way the audio sounds, also: "(kh)lep".
However, in order to get the exercise correctly, I have to put a hard "b" sound on the end, "(kh)lel(buh)". When I do that, the word lights up and I get a green "correct" response from Duo. That just doesn't seem right to me.
The (kh) sound to me is, well, quite frankly, much like the sound Americans make when they try to "hock a loogie" - expectorate thick nasal drainage from the back of the throat, but it's just not as strong.
I also hear an "f" in the Russian pronunciation: like "(kh)fle(bp)".
I also notice something - I think - the е in хлеб seems to have just a small trace of the "ye" sound you hear when reciting the Russian alphabet. I practice saying it "(kh)l-yeb", then try to kill of the "y" until it's almost not there, and make the b more like a p.
To me the recording seems to pronounce хлеб with a "p" sound at the end (khlep vs khleb). Is this just the recording/my hearing, or is the b sound in Russian very similar to a p, or is this a special case where the б is simply pronounced more like п? Obviously the sounds are very similar in English, but I am curious if I should correct my accent here or not.
You should be able to use both. If not, report it as a mistake.
In Russian, there are no Simple and Continuous tenses. Generally the meaning is clear from the context, although there are a few verbs that are always used for "simple" or "continuous" types of actions. For example, "ходить" means "go" in a regular matter (simple), and "идти" means rather "be going".
I couldn't understand the audio either: I thought it was u yest ...?... . But by clicking on the turtle, you can get a word by word pronunciation == and the individual words are also spoken more slowly. It's not natural and sometimes also misleading, but it is an alternative that I turn to when I can't understand the normal audio after two or three listenings.