Try the exercise on your own before checking the GDZ. This builds the "muscle memory" needed for the EGE (Unified State Exam).
Mastering the tricky rules of compound sentences. gdz po russkomu 10 klass grekov chetko kriukov 2017 god
The 2017 edition by Prosveshcheniye is designed to help students systematize everything they’ve learned since primary school. It covers: Try the exercise on your own before checking the GDZ