Learning new vocabulary is often easier if the word is learned through the context of an interesting text. Each child should create an item to sell, an item perhaps whose name begins with the same letter as that of the child. This could be used to focus on drawing to scale. Measure the real item then draw the item to a particular scale.
Cats figure into several books that have surprise conclusions.
Brett, Jan. Annie and the Wild Animals . Houghton Mifflin, 1985. Charlie Anderson Illustrated by Mark Graham. Margaret K. McElderry, 1990. McGraw's Emporium .