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Hoangtuanngoc
2 năm trước
Cho tam giác cân ABC (AB AC  ) nội tiếp đường tròn (O). Chứng minh rằng: BCsong song với tiếp tuyến tại A của đường tròn (O)
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Glass isn’t new. People were making glass bowls and bottles more .....than ....5,000 years ago, actually. But no one (1) .................ever found out who made glass first, or when and where that (2) ............... One story tells (3) ................that some men from a ship arrived on a beach and decided to make a meal. They made a fire on the sand and (4) ..................some small rocks in the middle of the fire to cook on. The fire burned (5) .................a very long time and the rocks got really hot. Little pieces of rock began (6) ................with the sand to make glass. So (7) ......................next time you look through a window, look at a mirror (8) .................. you are holding a glass of water, think, ‘Wow! This glass is made from very, very hot sand!’ Example: then than when 1. has have had 2. happen happens happened 3. them us him 4. put puts putting 5. from for off 6. mixed mixing mix 7. the a any 8. or because if

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