Additional features of the Hotline Workbooks are: culture spots. Each unit contains a culture spot section which highlights an aspect of British life and invites the students to compare and contrast this with life In their own country. serf-checks. Each unit contains a self-check of the main learning points in the unit. This allows the students to test themselves and at the same time provides the teacher with useful feedback on individual student progress. grammar summaries and explanations. To complement the problem-solving grammar approach of the Student's Book, the Workbook provides full grammar summaries and helpful explanations as well as additional grammar exercises. crosswords. Revision units feature a crossword for vocabulary revision.