Making an introduction

We are about to start creating our speeches and it's logical, that we start with nothing else but introduction. Lots of people know that right introduction can invole the audience to what you talk about or can make them understand that there is nothing to listen to, so that's why there are some ways out to make your introduction valuable and interesting:

• Asking questions
• Making references 
• Making a startling statement
• Giving a quotation
• Telling a story

Now, let's see what techinques people use the following videos:

1. “How will we survive when the population hits 10 billion?” by Charles C. Mann  at TED2018 https://www.ted.com/talks/charles_c_mann_how_will_we_survive_when_the_population_hits_10_billion 
   
   Here the speaker starts with a question and then gives his comment to it, slightly moving to his main point.
2. ''Still Standing” by Ramona J. Smith at the 2018 Toastmasters International World Champion of Public Speaking https://www.youtube.com/watch?v=7Tev43VNRIc 
   
   This woman tells a story and asking questions I think. And moreover, this style continues till the end of her speech which is incredible.
3. “Every kid needs a champion” by Rita Pierson at TED Talks Education https://www.ted.com/talks/rita_pierson_every_kid_needs_a_champion/discussion?...en  In this speech the speaker also starts with a story which happened to her and makes references to it.
4. “How great leaders inspire action” by Simon Sinek at TEDxPuget Sound  https://www.ted.com/talks/simon_sinek_how_great_leaders_inspire_action?referrer=playlist-the_most_popular_talks_of_all This speech starts with the questions and following comments to it.
5. “Looks aren't everything. Believe me, I'm a model” by Cameron Russell at TEDxMidAtlantic https://www.ted.com/talks/cameron_russell_looks_aren_t_everything_believe_me_i_m_a_model?referrer=playlist- the_most_popular_talks_of_all&language=en  This is the hardest speech to understand what type of attention-getter she uses as for me, but yet I think she tells a story of her life and also she gives quite a startling statement that your image is important, but superficial.

Now let's decide how good was the transition from the introduction to the main idea:

Before I start giving comments I would like to say that I can give 3 points out of 3 to each speaker, because their transition was smooth enought for me not to notice the border between the introduction and the main part of the speech.

1. In the first speech I think the introduction is a question and the main part, logically, is an answer to it.
2. The best speech as for me. I like it a lot and I would even give her 4 out of 3 because it seemed to be 7 minutes of introduction, or 7 minutes of the main part. There is no visuable border between parts of her speech and it's absolutely fantastic.
3. In this speech the statement of her speech is included to her story, that's logical and easy to follow.
4.  This speaker asks quite a lot of questions to his topic, but yet they all are important and connected with the main part of his speech.
5. This woman had been making references during the whole speech, right from the introduction.