Why is it a good idea to have note cards rather than a fully written-out speech? ОА
It's not
ОВ.
Reading directly from a sheet of paper makes it difficult to sound natural
Ос.
Reading directly from a sheet of paper can confuse the audience
O
D
Note cards mean you can condense a speech to its essential points

im not entirely sure what you're asking.

the first, third, and last sentences are correct for plato.

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.