Never hate the poor into passive voice

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

If the story "two kinds " has been told through suyuan's point of view, what type of narration would be appropriate

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.