Answer to Question 1
Answer: D
Explanation: D) Don't assume you can handle whatever comes up without some preparation. Learn enough about your audience members to get an idea of their concerns, and think through answers to potential questions.
Answer to Question 2
Answer: E
Explanation: E) Using a free service such as Tweet Deck, which organizes tweets by hashtag and other variables, you can monitor comments from people in the audience. To avoid trying to monitor the backchannel while speaking, you can schedule Twitter breaks, during which you review comments and respond as needed.