Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks.

Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as its atmosphere. Average temperature around the world have risen by 0.75°C (1.4°F) (32) ___ the last 100 years. About two thirds of this increase has occurred since 1975 in the past, when the Earth experienced increases in temperature it was the result of natural causes, but today it is being caused by accumulation of greenhouse gases in the atmosphere produced by human (33) ___. The natural greenhouse effect maintains the Earth's temperature at a safe level making it (34) ___ for humans and many other life forms to exist. However, since The Industrial Revolution what benefits human has significantly enhanced the greenhouse effect (35) ___ the Earth's average temperature to rise by almost 1°C. This is creating the global warming (36) ___ we see today.

4. What does the word “its” in the last sentence refer to?

3. How many hours did the 1880 bulb last?

2. Where was Edison’s laboratory?

Read the following passage, and choose the best answer that follow.

Thomas Alva Edison was born in Ohio in 1847. As a child, he received less than a year of formal schooling, but was educated at home. His parents allowed him to set up a laboratory in their basement and his mother gave him books about chemistry and electronics. Edison credits his mother as being ‘the making’ of him.

In 1878, Thomas Edison began serious research into developing a practical incandescent lamp and on October 14, 1878, Edison filed his first patent application for "Improvement In Electric Lights". In 1879 he created a successful incandescent light bulb. This was his hardest project – from 1877 to 1880, Edison and his assistants tried around 3000 experiments to perfect their light bulb design. By the end of 1880, Edison had produced a bulb that lasted 1500 hours. This discovery marked the beginning of commercially manufactured light bulbs and in 1880, Thomas Edison’s company, Edison Electric Light Company began marketing its new product.

5. What did her parents do?

4. How long did she travel in the space shuttle Challenger?

3. When did she become America’s first spacewoman?

2. What does she look like?

1. Who is America’s first spacewoman?