This is a picture of Mr. Green's family. 1 the picture we can see Mr. green, Mrs. Green, their son Jim 2  their daughter Susan. Mr. Green is3  in a chair. He is 4 a newspaper. Mrs. Green 5 some housework. Jim is a Middle School student. He is reading a book near the window.
   Look at 6 , she is playing with her toys 7 the floor. She is Mr. Green and Mrs. Green's daughter, Susan. 8 that behind Susan? It's a  9. What's the cat doing? It's playing  10 a ball.

位于我国最东部的沙地是（　　）