请阅读短文,从每小题所给的四个选项中选出能回答所提问题或完成所给句子的最佳答案。Hello, I'm a Chinese girl. My name is Dong Lingling. My English name is Mary. Look! These are schoolbags. The first one is mine. It is blue and blue is my favorite color. A yellow pencil box, a white cup, and books are in my schoolbag. Look! A map is in it, too. It's a map of China. The next one is my friend Bill Green's. Our mothers are good friends, too. Bill's schoolbag is brown. It is very big. His mother Betty buys it for him. The letters"B" and"G" are on it. Two pens, two books, a baseball and two dictionaries are in it. Bill can't find his blue notebook in his schoolbag. The notebook is very important to him. He writes many things on it. He wants to find it now.