This question is testing correct use of quotation marks. The error is that there are no quotation marks around "Keep working on the worksheet I handed out" because it is something the substitute teacher said directly. A corrected sentence would look like this: Before the subsitutute teacher left the room because she had too few books, she said, "Keep working on the worksheet I handed out." Or, if the substitute teacher said it indirectly, a corrected sentence could be this: Before the subsitutute teacher left the room because she had too few books, she said to keep working on the worksheet she handed out.

When a quotation is followed by a description of who said it, such as "said Emily," the sentence within the quotation must end with a comma before the final quotation mark. 

When the sentence within the quotation marks is a question, it must end with a question mark that lies before the second quotation mark. Then, the phrase describing who asked the question follows and ends with a period. 

Quotation marks, used to convey that someone is speaking, should always precede the first letter of the quotation, and follow the final punctuation mark of the quotation. If there is an intervening part of the sentence in the middle of a quotation, then it should be separated from the quotation marks by punctuation. The best way to correct the sentence above is: "I can't stand the old man's behavior in public," cried Angelina. "He is so rude."

Quotation marks, used to convey speech or direct quotation of written discourse, should always precede the first letter of the quotation, and follow the final punctuation mark of the quotation. If there is an intervening part of the sentence in the middle of a quotation, then it should be separated from the quotation marks by punctuation. The best way to correct the sentence above is: "The very old man said, 'I need a lot of help to get through my day, but that doesn't get me down.'"

Quotation marks, used to convey that someone is speaking, should always precede the first letter of the quotation, and follow the final punctuation mark of the quotation. If there is an intervening part of the sentence in the middle of a quotation, then it should be separated from the quotation marks by punctuation. Additionally, when there is a quotation in the middle of another quotation, all of the normal rules apply, you merely have to use single quotation marks instead of double quotation marks. The sentence above is correct as written.

In standard American English, quotations that end in an exclamation point or question mark require no further punctuation to set them off from the rest of the sentence; the comma following the quotation marks can be eliminated. 

The speaker in the sentence is asking a question, and questions that are inside quotation marks should always be ended with a question mark. The comma is unnecessary when the quotation is not a statement, so the fixed sentence should read, "'Oh no, do any of us know where to go?' he shrieked..."

Although the sentence does refer to what the sign says, quotation marks are inappropriate because the reference is an indirect quotation. The quotation marks can simply be removed to correct the sentence. If the sentence were rewritten to refer to the specific language the sign used, quotation marks would be correct. For example: As he washed his hands of the dye, he glanced up at a sign blaring, "EMPLOYEES: Remember to wash your hands and report any health concerns to your superiors before returning to work." 

Quotation marks, used to convey that direct speech or wording, should always precede the first letter of the quotation, and follow the final punctuation mark of the quotation. If there is an intervening part of the sentence in the middle of a quotation, then it should be separated from the quotation marks by punctuation. This sentence is missing a close-quote after the period.