根据短文内容，从短文后的选项中选出能填入空白的最佳选项。选项中有两项为多余选项。
How to prepare a lecture
Being invited to give a lecture is an honor．It means that people regard you as an authority on a given field, subject, or issue．It means you are worth listening to．  You have to make sure your lecture is interesting, and full of wisdom, from which the audience can take valuable insights．This is why it is important for you to prepare your lecture well．
1．Think of a good topic．
You most likely will be assigned to talk about a certain topic．If that's the case, you only need to make an outline and do some research．But in some cases, you will have to think of your own topic．Although it gives you more freedom to do it, thinking of a topic can be tricky．   Or pick a topic that is timely and socially relevant．
2．Make an outline for the lecture．
Start by listing down the points that you will discuss, and then fill in each point with subpoints．If necessary, make a research about your topic． But if in so doing you end up with a very long outline, figure how you can shorten the topic or cut where cutting is needed．
3． 
Statistics, figures, medical information, historical accounts, and similar information should all be checked and it will save your credibility as an authority on the subject you are talking about．
4．Add humor．
Don't engage your audience in a dragging soliloquy （独白）．  Humor will interest your audience．Of course, make sure the elements in your lecture are in line with your main topic and are not nonsense, racial, and offensive jokes．

A．Check your lecture for accuracy．

B．Giving a lecture is challenging, though．

C．If necessary, provide your contact information, such as an email address or blog site．

D．Instead, make your audience smile, or burst into laughter at certain points in your discussion．

E．To make it easier, consider what will interest your audience．
F．It should summarize your whole talk in one sentence．
G．Don't be afraid of exploring the topic, as this will allow you to discover other points that need discussion．