运用所学知识，说说上表数据发生变化的原因。
①***的正确领导 ②以经济建设为中心，大力发展生产力 ③社会主义本质 ④改革开放 ⑤坚持以公有制为主体的经济制度等（答对任意2点计2分）
下列说法正确的是（ ）
Tom: Hello, Mary. Is this your pencil box?
Mary: No. It's not my pencil box. My pencil box is blue and new.
Tom: Is it Rose's pencil box?
Mary: No. Her pencil box is pink. This pencil box is green and old. What's in it?
Tom: There are four pencils, two pens, six crayons and one ruler.
Mary: Oh, I see. It is Jack's pencil box. His pencil box is lost (丢失).
Tom: OK, let's give (给) it to him.
