阅读下列短文，从每小题的三个选项中选出最佳选项。

    It's autumn. It's cool and windy. Charlie is flying a kite in the park. His father is watching(观看).The kite is flying high(高) in the sky. They are happy. Look! The kite is not in the sky now. Where is it? Oh, it's in a tree. Charlie is sad. Charlie jumps and jumps. The tree is tall but he is short. He cannot get(拿到) the kite. Charlie's father is not very tall but he is clever(聪明的). Look, he is on a car. He can get the kite for Charlie. Charlie is happy.

全面建设小康社会，在经济方面，我们必须  (      )

①以经济建设为中心，大力发展生产力   ②坚持和完善人民代表大会制度 ③发扬艰苦奋斗的精神 ④坚持和完善以公有制为主体，多种所有制经济共同发展的基本经济制度 ⑤坚持依法治国的基本方略 ⑥坚持***的领导