用括号内所给动词的适当形式填空，必要进可加助动词或情态动词。

     Have you over soon Korean (朝鲜的) wrlting before?In many people 's eyes it    1  (look)lovely but difficult. Do you know the history of the apeciml lettera?

      Longa ago, Korean people   2   (not own)their lotters.At that time.they used Chincac cheraoters (汉字).

Because Chinese is hard to leam, only rich people had the money and time to ask tlachens   3   (toach)them.

One of their kinga (国王)was called Sejong. He decided loinvent Korean Letters, He   4  (think) hard, One day,

on October 9,1446,he looked at a win-dow frans (窗框) and shouted.