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Reading Skill

1.  Picture writing was useful. However, it did have some problems, too. Sometimes it was hard to understand. The signs for certain objects, ideas, or emotions weren't always very clear. ______________, picture writers needed many pictures to communicate their ideas. It was hard to invent signs for each of the many words that a writer wanted to communicate. Also, picture writing took up a lot of space on the animal skin or fiber, and these were difficult materials to prepare.

 ① At first                    ② In addition                ③ In other words 

  ④ Notwithstanding           ⑤ On the contrary