下图为我国东部地区某城市图，在①、②、③、④四地建自来水厂、造纸厂、仓库、食品厂.请将合理的数字字母填入横线上并说明其理由。

⑴Welcome home!

⑵The earth goes around the sun.

⑶It was Daming's birthday yesterday.

⑷This is a book about food.

⑸I'm interested in space travel.

first：____         loudly：____   learn：____

national：____      go：____

执行如图所示的程序框图，则输出的k的值是（　　）