One theme from Rikki Tikki Tavi would be courage. Rikki has to fight<span> two cobras, Nag and Nagaina, to protect his garden and Teddy. He is frightened of them because they are stronger and bigger than he is, but he overcomes his fear and fights them anyway.</span>
This may mean that the person in the future will not be able to understand or comprehend what a person is saying to them, if they do not listen to them now.......hopefully this helps
If you go to http://www.easybib.com/style you can fill out a page about your resource and easybib will create it for you
"Today nobody brought his or her instrument" is correct. It is common for people to use "their" in a sentence like this, but "his or her" is the more proper term.
