Why might you show an unusual object at the very beginning of your speech? PLZ HELP to grab your audiences' attention
to demonstrate a complex process
to remind readers of a popular song
to explain a difficult concept

A. to grab your audiences' attention

Explanation: People will gain automatic interest and curiosity if you show an unusual object at the very beginning of your speech. It'll also keep them interested enough to listen till the end of the speech as well^^

you need to add more so i can you

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).