从方框中选择正确的词，补全句子。     

(1)  I often see some children____  kites in the park at weekend.

(2)Yao Ming is ____ with young people.
(3)We____the world with plants and animals.
(4)The bookshop is ____  at this time everyday.
(5)My uncle keeps many____ on his farm.

“苏湖熟，天下足”这一谚语反映出太湖流域已成为全国最重要的粮仓，全国经济重心从黄河流域转移到长江流域。经济重心南移最终完成于(      )