Unlock Reading, Writing & Critical Thinking Student's Book with Digital Pack Level 4B (Units 5-8) prepares students for their academic studies by developing their reading, writing, critical thinking, and grammar for writing. QR codes on the pages give easy access to the audio of the reading passages. The video program sets the stage for each unit's topic with lessons in the Student's Book and the Digital Workbook. The Student's Digital Pack includes an eBook with interactive activities, audio and videos, Digital Workbook for additional practice, and downloadable audio. All content is mobile-friendly and can be accessed on any device.