Which sentence is the topic sentence? A. It was clearly a bird lover's room.
B. Two blue parakeets whistled in a small cage.
C. A huge red and yellow parrot sat on a perch.
D. On the sofa were needlepoint pillows shaped like birds.
E. Pictures of birds were on the walls.
F. A larage book, Birds of the World, lay on the coffee table.

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.