Questions 17-20 are based on the following talk about public speaking. you know have 20 seconds to read Questions 17-20.

　　17. What is the most important thing in public speaking ?

　　A. Confidence.

　　B. Preparation.

　　C. Informativeness.

　　D. Organization.

　　18. What does the speaker advise us to do to capture the audience's attention?

　　A. Gather abundant data.

　　B. Organize the idea logically.

　　C. Develop a great opening.

　　D. Select appropriate material. 19. If you don't start working for the presentation until the day before, you will feel _____ .

　　A. uneasy

　　B. uncertain

　　C. frustrated

　　D. depressed