1. Using animals or thins on the page, make a comparative sentence as in the example. e.g. An airplane is much faster than a lion. (Is this one grammatical? Would you let me know a website related to comparative, superative, etc.?)

That sentence is correct.

http://www.eflnet.com/tutorials/adjcompsup.php

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/regcom.htm