Every lesson has two sections: TheA escuchar!section accompanies the Lab Audio CD Program, and includes: listening, speaking, and writing practice pronunciation exercises TheA explorar!section, correlated with the text lessons, offers: contextualized and personalized activities that give students the writing exposure needed with the grammatical concepts being reviewed reinforcement of vocabulary through a variety of exercises including crossword puzzles, word searches, etc. open-ended, communicative topics for personalized writing An answer key to all written exercises is provided so that students can monitor their progress throughout the program.