用方框中所给单词的适当形式填空，每词仅用一次（每空一词）。
real pleasure pioneer invent daily |
Paul: Hey, Jenny, the subject for my school project is "Small invention that changed the world". Can you help me think of an invention?
Jenny: With ! Let me think ... hmm ... I know! The zipper!
Paul: The zipper? Is it such a great invention?
Jenny: Think about how often it's used in our lives. You can see zippers on dresses, trousers, shoes, bags ... almost everywhere! I saw a website last week. The of different inventions were listed there. For example, it mentioned that the zipper was by Whitcomb Judson in 1893. But at that time, it wasn't used widely.
Paul: So when did it become popular?
Jenny: Around 1917.