The role of the language material of the orthographic exercises in the process of training a spelling skill

Basing on the researh of possible influence of the orthographical exercises on the process of improvement of juniour high school students' spelling skill, the author explains the essense of the problem of selecting the language material for the russian language lessons. The novelty of the article is in regarding the practicability of the use of language units of various levels as a language material for training a spelling skill.