"PLEASE RETURN BOOKS ON THE SHELVES AFTER READING. DON’T LEAVE THEM ON TABLES."
XVI. Look at the signs. Choose the best answer for the question.
A. You need to put the books both on the table and the shelves. B. After you finish reading, you have to put the books back on the shelves. C. You can leave books either on the shelves or on the tables. D. Books should be left on the tables instead of the shelves.
