Do you think liyang's crazy english is useful

Do you think liyang's crazy english is useful What do you think of the lecure of Li Yang's Crazy English? what do you think of the English training center is useful f English is very useful l ,I think do you think i'm crazy? What do you think is the most useful invention?这句中do you thi Which of these do you think is the most useful invention?中do 问句：What do you think of the speech of LI Yang's Crazy Englis which is the most useful great inventions?what do you think? what do you think is the most useful invention in the world Do you think that _______ is more useful than gold?选项:a、Iron 连词成句 What do useful you think invention is the fourth most