What is the main topic of the conversation
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The zipper is a wonderful invention. They are very common so we forget that they are wonderful. They are strong, but they open and close very easily. They come in many colors and sizes. In the 1810s, people in the USA wore high shoes and clothes with a long row of buttons. It was hard for them to wear anything. They wanted an easier way to put on and take off clothes. Whitcomb Judson invented the first zipper in 1839. He called it a slide fastener. A zipper has three parts. There are dozens of metal or plastic teeth in two rows. These are fastened to two flexible strips of cloth. A fastener slides along and fastens the teeth together. When it slides the other way, it takes the teeth apart.

- I like Chung Cakes, Day Cakes most
- It's a folk tale.
- The main characters are Prince Tiet Lieu, his wife, and Emperor Hung Vuong
- Emperor Hung VUong annouced that the prince who made the most delicious food would become the new emperor. Prince Tiet Lieu and his wife pleased the emperor by creating two types of rice cakes that represented Heaven and Earth. Emperor Hung Vuong made Tiet Lieu the new emperor.
(mình đã dựa vào SGK, bạn có thể tham khảo SGK. Chúc bạn học tốt!)

Đáp án: 1. The history of the internet (Lịch sử của Internet)

Much ( literate)LITERACY on marketing of the non-profit (organize) ORGANZATION notes a (reluctant)RELUCTANCE on the part of staff, and also the public at large, to accept the (important)IMPORTANCE of marketing in their (continue)CONTINUAL operation. This can (large) be explained by a (misunderstand)MISUNDERSTANDING of marketing and what it entails, (main) MAINLY due to the powerful (commerce) COMMERCIALmessages and branding propagated by giant multinational corporations. A common (perceive)PERCEPT of marketing is the multi-million dollar face of Michael Jordan promoting the Nike brand or petro-chemical companies greening their logos in attempt to garner an (environment) ENVIRONMENTAL(friend) UNFRIENDLY image.