A word box at the top holding eight owners, and four tall columns underneath headed HIS, HER, ITS and THEIR. Ted, Ann, the pig, the twins, Mom, the bird, Mr. Lee, Ann and Ted.
This one takes the sentence away entirely. There is no blank to fill and no context to lean on, just the owner and the question of which word goes with it, which is the rule stated as plainly as it can be. A child who has been getting the right answers from the pictures on other sheets will find out here whether they actually have the rule.
Each column takes exactly two, and there are two writing lines in each box to say so. That built-in check catches the usual mistake, which is putting the twins and Ann and Ted in different places when both are their.
Mr. Lee is the one worth watching. A title rather than a first name throws some children, and it is a useful thing to have thrown them once on a worksheet rather than later.