Section D: 16. What is the purpose of the video lib r ar y ? To help people improve their . 17. What problem may people have when using the library for the first time? They may have difficulty understanding . l8. What are people advised to do when listening to the video? Write down the . l9. What should people do in listening to each conversation? Try to notice the . 20. How can people start watching their first video? All they need to do is to click on the link of .