单项选择题A．He’s preparing for a test.B．He lost his notes.C．He missed the class.D．He’s studying this subject.

单项选择题A．He has been shopping around.B．He has been looking for a job.C．He has been dining in a restaurant.D．He has been driving the cab.

单项选择题A．Less than 15 hours.B．15 Hours on average.C．Up to 20 hours.D．30 hours at most.

单项选择题A．Advantages and disadvantages of freezers.B．The best energy-efficient freezer.C．Defrosting a manual defrost freezer.D．Choosing and caring for a freezer.

单项选择题A．He was eager to do the course.B．He had done a lot of outdoor exercise.C．He enjoyed adventurous activities.D．He was timid and reluctant to go to the course.