Complete IELTS Bands 4-5 Workbook with Answers with Audio CD

Very academic

This comes with a CD for students to practise listening as well as grammar, reading, writing and vocabulary. The key at the back also means that the teacher does not have to mark reams of similar exercises. The students can use the book independently. However, whether to encourage your students to buy the workbook with key or without depends on the maturaity of your students.