What is the purpose of the video library? To help people improve their ___________________ abilities. 17.What problem may people have when using the library for the first time? They may have difficulty understanding __________________. 18.What are people advised to do when listening to the video? Write down the __________________________ they hear and understand. 19.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 _________________________