单项选择题
Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.Now, listen to the passage.
Which course(s) runs or run for one hour each time（）
A．Conversation class. B．Writing skills class. C．Examination skills class. D．All of the three courses.
单项选择题 I must leave now（） if you want that book I'll bring it next time.
单项选择题 According to the talk, the owner of a bike has to （）
单项选择题 At the university Mr. Robinson specialized in （）
