[originaltext] Good morning, everyone. And welcome to the English for Academ

Good morning, everyone. And welcome to the English for Academic Purpose Center. I’d like to begin by briefly introducing the services we offer here at our center. First of all, we have wide range of language courses. In the first semester, we run an 8-week conversation class for students of non-English speaking backgrounds. We wish to improve their fluency, grammar and pronunciation in English. The course is held on Tuesdays between 12:30 and 1:30. So that’s one hour a week. Please enroll with the secretary before Friday this week. For those of you who are interested in developing your writing skills, we have a 6-week course which runs for 2 hours between 4 and 6 on Wednesday afternoons, beginning in Week One. They concentrate on the writing skills needed for assignments in the departments of economics and social sciences. Students must be enrolled in either of these departments. You’re probably not thinking about taking examinations yet, but later on, towards the end of the term, you might like to enroll in our examination skill class. The course runs for 5 weeks, and two hours in a week. The course deals with the skills you need, in both written tests and oral examinations. It is not necessary to enroll before the course starts. Just run up for the first class.
Q. 15. Which course(s) runs or run for one hour each time?
Q. 16.Which course(s) does or do NOT require enrollment beforehand?
Q. 17.Which course(s) is (are) designed especially for students of economics and social sciences?
Q. 18.Which course(s) is (are) the shortest?