The book is so---(help) that I want to buy it.

Can you tell me the___(important) of learning English.
答案：importance
翻译；你可以告诉我学习的重要性吗?
答案：The book is so【helpful】that I want to buy it.
翻译；这本书太有用了我想要去买它.
解析：helpful是个形容词,翻译为有用的.
【你的10分满意,我们团队的无限动】