Question

17. Identify the sentence that contains an error in punctuation or capitalization. • "Good morning," Ms. Roper said. "Please open your copies of The Hobbit to page 45." • "I've left my book at home, said Emily. "May I share with someone else?" • Ms. Roper handed out an article on J. R. R. Tolkien from Smithsonian magazine. • "I can’t wait to read the rest of his books," said Rick.

Answer 1

The sentence that contains an error in punctuation is the sentence, "I've left my book at home," said Emily. 
There should be quotation marks before and after what Emily says. 

"I've left my book at home", said Emily.