Q: NEW YORK (CNN) -- A 14-year-old girl disappears on her way home from school, another is last seen near her home and a 16-year-old vanishes after leaving her fast-food job for the day.

Amanda Berry is shown near the time of her disappearance in 2003, and how she might appear today.

All from the same neighborhood in Cleveland, Ohio, the girls disappeared within five blocks of each other over a four-year span, starting in 2003.

Agents and detectives from the FBI and Cleveland Police are looking into hundreds of leads in the cases and whether they may be linked, according to FBI Special Agent Scott Wilson in the agency's Cleveland bureau.

"We kind of put all three of these cases together to work them to see if there's any connection," Wilson said.

Amanda Berry, 16, vanished on April 21, 2003, after she left her job at a Burger King at about 7:30 p.m. But she never made it to her home just a few blocks away, the FBI says. Berry has pierced ears, a pierced left eyebrow and a scar on her lower abdomen. She would now be 22.

Georgina DeJesus was last seen at a pay phone around 3 p.m. on April 2, 2004, as she headed home from school. She and a friend had called the friend's mother seeking permission for a sleepover at DeJesus' house, but the answer was no.

The girls then parted ways, and DeJesus was never seen again. She was wearing a white jacket, a sky blue sweater, blue jeans and a cream shirt. She has a light birthmark on her right leg and pierced ears, the FBI says. DeJesus was 14 when she disappeared and would now be 19.

1. Burger King
2. 16
3. just a few blocks away
4. about 7:30 p.m.
5. unknown
6. never made it to her home
7. April 21, 2003
8. 22
9. She and a friend had called the friend's mother seeking permission for a sleepover at DeJesus' house
10. a friend
11. at a pay phone
12. April 2, 2004
13. from school
14. no
15. 14
16. right leg
17. white
18. blue
19. Cleveland, Ohio
20. same

Numbered questions:
1. Where did Amanda Berry work?
2. How old was she?
3. How far from home was her job?
4. What time did she get off?
5. How did she get there?
6. What time did she get home?
7. What was her last day of work?
8. What is her current age?
9. Where did DeJesus want to spend the night?
10. Who did she want to spend the night with?
11. Where was she around 3?
12. What day was it?
13. Where was she coming from?
14. Was her friend allowed to spend the night?
15. How old was she?
16. Where is her birthmark?
17. What color is her jacket?
18. What about her jeans?
19. What city did she live in?
20. What about Amanda?

input: Make use of the article to answer the questions. David Moore taught science at the City School. He needed some expensive books, and so he bought them. He put the books in his car in a quiet street. Then he went to other shops to buy something else. At six he came back to the car. One door was open - and the books were not there! David drove home to Fry Road. On Friday people read this in the newspaper: Books: Have you any old books? I buy old and modern books. Open all day on Saturdays. David Moore, 26 Fry Road. David stayed at home on Saturday. The first man came at eight. David took him to the kitchen. At half past nine another man arrived. He had a bag under his arm. "Mr Moore?" the man asked. "That's right," David said. "Can I help you?" "I've got some good books. You buy books, don't you?" "Yes. Bring them in. Let me have a look." Soon the books were on the dining-table. "Come in now," David called, "and bring the list." A policeman came into the dining-room. He read the names on the books and the names on the list in his hand. They were the same. "Come with me, sir," the policeman said to the man. 1. What does David Moore do?
2. Where?
3. What subject?
4. Where does he live?
5. What is the house number?
6. What did he need for his class?
7. How did he get them?
8. Did he buy anything else?
9. Did he carry the books around?
10. What did he do with them?
11. Did they remain there?
12. What happened to them?
13. When did he realize they were gone?
14. What did he do when he discovered this?
15. What did people read on Friday?
16. What person was in the ad?
17. What was the ad trying to sell?
18. When?
19. Where?
20. Was anyone arrested for the crime?
numbered_answers: 1. teaches
2. at the City School
3. science
4. Fry Road
5. 26
6. books
7. he bought them
8. yes
9. no
10. put them in his car
11. no
12. they were stolen
13. At six
14. drove home
15. an ad in the newspaper
16. David
17. it was to buy books
18. Saturdays
19. 26 Fry Road
20. yes

Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experimental tools to probe these phenomena.

The advancement of science generally depends on the interplay between experimental studies and theory. In some cases, theoretical physics adheres to standards of mathematical rigor while giving little weight to experiments and observations. For example, while developing special relativity, Albert Einstein was concerned with the Lorentz transformation which left Maxwell's equations invariant, but was apparently uninterested in the MichelsonMorley experiment on Earth's drift through a luminiferous ether. Conversely, Einstein was awarded the Nobel Prize for explaining the photoelectric effect, previously an experimental result lacking a theoretical formulation.

A physical theory is a model of physical events. It is judged by the extent to which its predictions agree with empirical observations. The quality of a physical theory is also judged on its ability to make new predictions which can be verified by new observations. A physical theory differs from a mathematical theorem in that while both are based on some form of axioms, judgment of mathematical applicability is not based on agreement with any experimental results. A physical theory similarly differs from a mathematical theory, in the sense that the word "theory" has a different meaning in mathematical terms. A physical theory involves one or more relationships between various measurable quantities. Archimedes realized that a ship floats by displacing its mass of water, Pythagoras understood the relation between the length of a vibrating string and the musical tone it produces. Other examples include entropy as a measure of the uncertainty regarding the positions and motions of unseen particles and the quantum mechanical idea that (action and) energy are not continuously variable. What are the answers to this following set of questions: 1. What is theoretical physics used to explain?
2. Can it also predict things?
3. What does it employ?
4. What part of physics is it different from?
5. What did Einstein develop?
6. What did he win for this?
7. What does a physical theory involve?
8. What keeps a boat above water?
9. Who figured this out?
10. Did he also study musical tone?
Answer:
1. natural phenomena.
2. yes
3. matematical models
4. This is in contrast to experimental physics, which uses experimental tools to probe these phenomena.
5. an explanation of the photoelectric effect
6. the Nobel prize
7. it's a model of physical events/
8. it displaces its mass of water
9. Archimedes
10. Pythagoras understood the relation between thno