a.      Viết đoạn văn phân tích  vẻ đẹp của bức tranh Đèo Ngang qua 4 câu thơ đầu, có sử dụng 1 quan hệ từ, 1 đại từ.

"Wiki" means "quick" in Hawaiian. The word is used to describe websites that are written  (1. write) by people who use the site. Anyone who visits a wiki website can add or change the information on the page. The first wiki website was created (2. create) by Ward Cunningham in 1995. Since then, wiki guidebooks, wiki dictionaries, and wiki encyclopedia have been published_(3.publish) on the Internet. The most popular online encyclopedia is "Wikipedia". Over 22 million entries have been added_(4. add) since it started, and it is now the most detailed encyclopedia in the world. According to the creator of Wikipedia, the work_has been done_(5. do) by 20.000 people who regularly edit the pages. The amazing thing is that the information is completely free.