Cho đường trong (O;R), AB là dây của đường tròn(O). M là điểm bất kì di chuyển trên đường thẳng AB và nằm ngoài đường tròn (O). Kẻ tiếp tuyến MC,MD với đường tròn (O)(C,D là các tiếp điểm).OM cắt CD tại H. Chứng minh khi điểm m di đọng trên đường thẳng AB và nằm ngoài đường tròn (O) thù H luông di động trên một đường tròn cố định

Vì sao Vàng bạc được dùng làm đồ trang sức

Read the following passage and decide whether the statements are true (T) or false (F).

We use many different energy sources for the sake of us. Energy sources are classified into two groups: non-renewable and renewable.

Non-renewable energy sources are those that take millions of years to form and will run out some day. It is energy that comes from fossil fuels such as coal, crude oil, and natural gas. Fossil fuels are mainly made up of carbon and were formed millions of years ago. The chemical reaction which takes place when we burn fossil fuels releases carbon compounds such as carbon monoxide and carbon dioxide into the air. Carbon dioxide is one of the green house gases which is contributing to global warming and air pollution.

On the other hand, renewable energy sources will never run out, are better for the environment and do not cause pollution. Renewable energy is often called green energy because it is a natural energy, always available and does not have to be formed like non-renewable energy. The green energy is always there. For example, the Sun consistently shines, water is abundant, and the wind blows throughout the year. The five types include solar energy from the Sun; geothermal energy from heat within the Earth; hydroelectric energy from moving water; biogas from dead plants and microorganisms and finally, energy from the wind.

10. I got this fantastic pumpkin from the local ________.

A. baker’s

B. greengrocer’s

C. jeweller’s

D. newsagent’s

14.11. They _______ the festival with music, lights, fireworks and traditional sweets.

A. celebrate

B. look

C. parade

D. eat

15.12. Someone’s carbon ________ is a measurement of the amount of carbon dioxide that their activities produce.

A. footprint

B. energy

C. effect

D. amount

16.13. There are some local ________ who are dancing on the stage to welcome the spring festival.

A. performances

B. performer

C. performers

D. performing

17.14. The Elephant Race Festival in Dak Lak is a race between elephants that are ridden by their ________.

A. own

B. owning

C. to owning

D. owners

18.15. She doesn’t look ________ her clothes so they look very old.

A. for

B. at

C. after

D. by

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