C

    Billy doesn't go to school today．He wants to read a storybook．His brother bought(买)one for him yesterday．Billy likes this book．

    Billy goes to his bookcase．The book is not there．Billy looks under the bed, but it isn't there． No, it isn't．He looks inside his schoolbag，but he still(仍然)can't find the book． Billy isn't happy． ．

    Billy goes to the living room(客厅)．His mom is reading a book on the sofa．

    " " asks Billy．

    "Which one?" says his mom．

    "The one about a dog," says Billy．

    "It's in your brother's bedroom," says his mom．"I found it on the table after breakfast．I thought it was his book． "

    "Great! Thanks, Mom," says Billy．

根据材料内容：从方框中选择合适的句子填入文中空缺处，使材料完整、通顺。