For teacher manuals and keys, you can check the Prosveshcheniye Publisher website.

If you are looking for "GDZ" (Ready Homework Answers) or a "Long Story" from this specific curriculum, you are likely referring to the reading sections in the textbook which often focus on themes like teenage life, travel, and famous people. Since I cannot browse the full copyrighted contents of the textbook live, here is an original "Long Story" inspired by the typical themes and vocabulary level found in the Kuzovlev 9th-grade curriculum (Unit 1: "Reading... Why not?"): The Hidden Library

Alex was never much of a reader. In his small town, most kids his age spent their summers at the lake or playing football. However, one rainy Tuesday, he found himself seeking shelter in the town’s oldest building: the Central Library.

Sites like InfoUrok often host teacher's books (Kniga dlya uchitelya) which contain the full answer keys for all exercises.