The midterm examination will consist of 90 questions, covering Unit 1, 2, and 3 up to 3.4 only. Nearly half of the exam come from Pretest and Posttest whose teacher scripts could be obtained on Pages 369-374 in our coursebook. So you can work out the Key to the Pre- and Posttest. I attached the Key to Unit 1 Exercises, Unit 2 Exercises, Unit 1 End of Unit Self-assessment, and Unit 2 End of Unit Self-assessment for you to check your answers.