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Yes, they are.



Наша группа останется (perfective - future tense) в Тбилиси до вторника. - I would use this one to just convey the fact that the group stays in Tbilisy till Tuesday.
Наша...

/бес здачи/ is only possible if you make a pause between the two words, but if you don't make one, and to be frank you almost always don't, it would be /без":"дачи/. And yes, we always hear the...

No, it would be pronounced like

/s:estroi/
/v":"oine/

I think you know what this ":" symbol means in IPA? It means a long sound. In this case a long consonant

So
сестрой - /sestroi/
с...

No, it won't, if you double it it won't sound naturally but as if you have troubles with pronuncing the words, because you'll have to make a pause between words to enunciate the "з" sound twice, and...

Well, it was supposed to be such a question but you killed the trick by being correct :D

Anyway, one question is still in the air. How do you link the two "з" in the natural flow of speech?...

With that said, Zorro, would you mind trying to guess how you should link these two words? :crazy:

без сдачи