GDZ.ru offers a digitized version of the textbook with solutions for every exercise.
Мой брат служит в (в чём? — П.п., 1-е скл., окончание -и). 2-е скл. на -ие
На райсовета взвилось знамя (на чём? — П.п., 2-е скл. на -ие, окончание -и). 2-е скл. на -ие
Euroki.org is useful for finding variations of the same exercise if your textbook version differs slightly. 2-е скл. на -ие
The exercise usually requires students to complete sentences by inserting the correct case endings for nouns or analyzing verb conjugations. : Completing noun endings or verb analysis. Sample Solution (Noun Endings) :
Megaresheba.ru provides a step-by-step breakdown for both Part 1 and Part 2.