The students began to study _____ five in their science books: chapter. The first ______ was the study of the scientific method: lesson. Each student had to write a _____ explaining their hypothesis on the effects of having a bedtime: letter. The students had to pay close ______ and follow the directions that they were given: attention. Many _____ found a serious problem with the behavior of kids who didn't have a certain time to go to bed: students. Kids that _____ to bed whenever they please, are also more likely to do poorly in school: retreat. After the study, the kids wanted to ______ parents to come to the school to tell them the importance of setting a nighttime routine: invite. Choose the sentence that uses the correct grammar: Please bring cookies, candy, and cards to the Valentine’s Day party.