Here is a story of how that search usually goes down and where those 4th-grade materials actually are: The "Dead Link" Quest
Back then, file-sharing was the only way to get digital copies easily. Today, downloading from old "mirror" sites like Letitbit is risky because they often host or phishing scripts instead of the actual homework.
You can still find physical or licensed digital copies of the Buneev 4th Grade set (Part 1 and Part 2) at specialized stores like SBooks or Shkola 2100 outlets. Here is a story of how that search
Finding that specific file on Letitbit is actually a bit of a "digital archeology" mission. Letitbit was a massive file-sharing site back in the day, but it’s essentially a ghost town now after years of legal pressure and changing internet laws.
Fast forward to today: that same link will likely lead to a "404 Not Found" or a parked domain page. The "Variant 2" book by (often part of the "School 2100" curriculum) has since moved from the wild west of file-sharing to official digital libraries and bookstores. Where the Files Live Now Finding that specific file on Letitbit is actually
Most teachers have moved these files to Google Drive or Yandex Disk , which are much safer and faster than the old Letitbit days. Why the Shift?
If you’re looking for these specific verification and control works ( ПроверочныеП р о в е р о ч н ы е контрольныек о н т р о л ь н ы е работыр а б о т ы ), here’s the modern way to find them: The "Variant 2" book by (often part of
Sites like the Russian State Library (NEB) often have these listed for academic reference.