Controlling Idea: Some middle school students work at summer service camps to help others during their break.

the third bullet "Most middle school students have a break from school for 10 weeks during the summer."

mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia