You need to check each sentence for errors. If there's an extra letter, such as the "s" in "reads" (#1) you need to use the symbol which deletes a letter. If a sentence/word is missing a word/letter... you need to use a symbol to show that a word/letter should be shown there.
The wolf is biggr and stronger than the last pig, but that pig was so smart that he kept tricking the wolf and finally killed him with his tactics unlike the other pigs who got eaten by the wolf.