This hard worksheet challenges second graders to think carefully about compound words. Part A uses four multiple-choice questions, asking which word is a compound, which two words build 'toothbrush', and which word is NOT a compound. Part B follows with five fill-in-the-blank questions that join parts like 'tooth + paste', 'butter + fly', and find the missing half of 'popcorn'. Students must decode, spell, and reason about each answer.