The document provides examples of using relative clauses to fill in blanks in sentences. It includes 21 examples of sentences with blanks that can be filled using relative pronouns like "that", "which", "who", "when", "where", etc. It also includes examples of joining sentences and using conditionals and different verb tenses including the present simple and continuous, present perfect, past simple and continuous, and past perfect. The document is a grammar exercise providing examples of using various parts of English grammar in context.