input: Make use of the article to answer the questions. Zinc is a chemical element with symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table. In some respects zinc is chemically similar to magnesium: its ion is of similar size and its only common oxidation state is +2. Zinc is the 24th most abundant element in Earth's crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest mineable amounts are found in Australia, Asia, and the United States. Zinc production includes froth flotation of the ore, roasting, and final extraction using electricity (electrowinning).

Brass, which is an alloy of copper and zinc, has been used since at least the 10th century BC in Judea and by the 7th century BC in Ancient Greece. Zinc metal was not produced on a large scale until the 12th century in India and was unknown to Europe until the end of the 16th century. The mines of Rajasthan have given definite evidence of zinc production going back to the 6th century BC. To date, the oldest evidence of pure zinc comes from Zawar, in Rajasthan, as early as the 9th century AD when a distillation process was employed to make pure zinc. Alchemists burned zinc in air to form what they called "philosopher's wool" or "white snow". 1. What does Zn symbolize?
2. what is it?
3. what is the atomic #?
4. which group is it found in an the chart?
5. what is the chart's title?
6. How is brass related to zinc?
7. when did people start using it?
8. where?
9. Was Zinc metal produced on a large scale?
10. when did it start?
11. when did Europe discover it?
12. How far back does zinc production date back?
13. where?
14. where is the oldest evidence of the element found?
15. what method was used in it's production?
16. why was zinc burned in air?
17. what was another name for it?
18. who burned it?
19. Is zinc the most abundant element found?
20. how does it rank?
numbered_answers: 1. Zinc
2. a chemical element
3. 30
4. group 12
5. the periodic table
6. Brass is an alloy of copper and zinc
7. since at least the 10th century BC
8. in Judea
9. no
10. the 12th century in India
11. the end of the 16th century
12. the 9th century AD
13. Rajasthan
14. Zawar
15. distillation
16. o form what they called "philosopher's wool
17. white snow
18. Alchemists
19. no
20. 24th

input: Make use of the article to answer the questions. Edmund Halley was an English scientist who lived over 200years ago. He studied the observations of comets which other scientists had made. The orbit of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists who dealt with such problems.

However, Halley had a friend named Isaac Newton. Who was a brilliant mathematician. Newton thought he had already which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse.

Now Halley set to work. He figured out the orbits of some of the comets that had been observed by scientist. He made a surprising discovery. The comets that had appeared in the years 1531, 1607 and 1682 all had the same orbit. Yet their appearances had been 75 to 76 years apart.

This seemed very strange to Halley. Three different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets, as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again.

It was an astonishing idea! Halley felt certain enough to make a prediction of what would happen in the future. He decided that this comet would appear in the year 1758. There were 53 years to go before Halley's prediction could be tested.

In 1758 the comet appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet been called Halley's comet, in his honor. 1. Who was Edmund Halley?
2. Of what nationality?
3. How long ago did he live?
4. What did he study?
5. What could he not figure out?
6. Who was Halley's friend?
7. Who was he?
8. What years did the comet appear?
9. Did they all have the same orbit?
10. How many years apart were they?
11. What did Halley predict?
12. In what year?
13. Did the comet appear?
14. Was he alive to see it?
15. What was the name of the comet?
16. How many years did it take for the comet to come back?
17. Did other scientists try to figure it out?
18. Were they successful?
19. What shape did the comet's orbit have?
20. Who figured that out?
numbered_answers: 1. a scientist
2. English
3. more than 200 years ago
4. comets
5. the orbit of a particular comet
6. Isaac Newton
7. a methematician
8. 1531, 1607 and 1682
9. yes
10. 75 t o76
11. the comet would come back
12. 1758
13. yes
14. no
15. Halley's comet
16. 76 years
17. yes
18. no
19. ellipse
20. Newton

input: Make use of the article to answer the questions. Mary was waiting for the airplane to take off. She was happy to get a seat by herself. Just then, an air hostess came up to her and asked. "Would you mind changing your seat? A man would like to sit with his wife." The only available seat was next to a girl with her arms broken, a black-and-blue face, and a sad expression . "I don't want to sit there," Mary thought at once. But then a soft voice inside spoke, "She needs help." Finally, Mary moved to that seat. The girl was named Emily. She had been in a car accident and now was on her way for treatment. When the snacks and juice arrived, Mary realized that Emily could not feed herself. Mary thought about offering to feed her but she hesitated , as it seemed too impolite to offer such a help to a stranger. But then Mary realized that Emily's need was more important. Mary offered to help her eat. Although Emily was uncomfortable to accept, _ . They became closer and closer in a short time. By the end of the five-hour trip, Mary's heart had warmed, and the time was really better spent than if she had just sat by herself. Mary was very glad that she sat next to Emily and fed her. Love sometimes goes beyond human boundaries and removes the fears that keep people away. When we reach our hands to help another, we get to live in a larger and more pleasant world. 1. Who was injured on the plane?
2. What was wrong with her?
3. Who rests next to her?
4. Does she want to?
5. Why not?
6. When did they begin to fight?
7. How many hours was the flight?
8. Was it her original seating arrangement?
9. Who requested that she switch?
10. Why?
11. What did she do to assist the other passenger?
12. Was she comfortable with it?
13. Did that stop her?
14. Why not?
15. Was she ultimately happy she didn't fly alone?
16. What did she learn about hate?
17. Where did they land?
18. What makes the earth a better place?
numbered_answers:
1. Emily.
2. Her arms broken, a black-and-blue face.
3. Emily.
4. No.
5. Seemed too impolite.
6. They didn't fight.
7. Five hours.
8. No.
9. An air hostess.
10. A man would like to sit with his wife.
11. Mary offered to help her eat.
12. No.
13. No.
14. Emily's need was more important.
15. Yes.
16. Love sometimes goes beyond human boundaries.
17. On her way for treatment.
18. Reaching our hands to help another.