TASK DEFINITION: You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.
PROBLEM: Paragraph- Sent 1: In the popular mind, the history of Hong Kong, long the entryway to China for Westerners, begins in 1841 with the British occupation of the territory.
Sent 2: However, it would be wrong to dismiss the long history of the region itself.
Sent 3: Archaeologists today are working to uncover Hong Kong's past, which stretches back thousands of years.
Sent 4: You can get a glimpse into that past at Lei Cheng Uk Museum's 1,600-year-old burial vault on the mainland just north of Kowloon.
Sent 5: In 1992, when construction of the airport on Chek Lap Kok was begun, a 2,000-year-old village, Pak Mong, was discovered, complete with artifacts that indicated a sophisticated rural society.
Sent 6: An even older Stone Age site was discovered on Lamma Island in 1996.
Sent 7: While Hong Kong remained a relative backwater in early days, nearby Guangzhou (Canton) was developing into a great trading city with connections in India and the Middle East.
Sent 8: By a.d.
Sent 9: 900, the Hong Kong islands had become a lair for pirates preying on the shipping in the Pearl River Delta and causing a major headache for burgeoning Guangzhou; small bands of pirates were still operating into the early years of the 20th century.
Sent 10: In the meantime, the mainland area was being settled by incomers, the "Five Great Clans": Tang, Hau, Pang, Liu, and Man.
Sent 11: First to arrive was the Tang clan, which established a number of walled villages in the New Territories that still exist today.
Sent 12: You can visit Kat Hing Wai and Lo Wai, villages with their walls still intact.
Sent 13: Adjacent to Lo Wai is the Tang Chung Ling Ancestral Hall, built in the 16th century, which is still the center of clan activities.
Sent 14: The first Europeans to arrive in the Pearl River Delta were the Portuguese, who settled in Macau in 1557 and for several centuries had a monopoly on trade between Asia, Europe, and South America.
Sent 15: As Macau developed into the greatest port in the East, it also became a base for Jesuit missionaries; it was later a haven for persecuted Japanese Christians.
Sent 16: While Christianity was not a great success in China, it made local headway, evidenced today by the numerous Catholic churches in Macau's historic center.
Sent 17: Intermarriage with the local Chinese created a community of Macanese, whose culture can still be seen in Macau's architecture and cuisine.
Question: Who were the first Europeans to control the greatest port in the East? (A) The Portuguese (B) South Africans (C) Asians (D) The British.

SOLUTION: A.

PROBLEM: Paragraph- Sent 1: What a time of it Dawson's Landing was having!
Sent 2: All its life it had been asleep, but now it hardly got a chance for a nod, so swiftly did big events and crashing surprises come along in one another's wake: Friday morning, first glimpse of Real Nobility, also grand reception at Aunt Patsy Cooper's, also great robber raid; Friday evening, dramatic kicking of the heir of the chief citizen in presence of four hundred people; Saturday morning, emergence as practicing lawyer of the long-submerged Pudd'nhead Wilson; Saturday night, duel between chief citizen and titled stranger.
Sent 3: The people took more pride in the duel than in all the other events put together, perhaps.
Sent 4: It was a glory to their town to have such a thing happen there.
Sent 5: In their eyes the principals had reached the summit of human honor.
Sent 6: Everybody paid homage to their names; their praises were in all mouths.
Sent 7: Even the duelists' subordinates came in for a handsome share of the public approbation: wherefore Pudd'nhead Wilson was suddenly become a man of consequence.
Sent 8: When asked to run for the mayoralty Saturday night, he was risking defeat, but Sunday morning found him a made man and his success assured.
Question: What was the most glorious event at Dawson's Landing? (A) The grand reception at Aunt Patsy Cooper's (B) The robber raid (C) The duel (D) The mayor election.

SOLUTION: C.

PROBLEM: Paragraph- Sent 1: You know that friction also causes heat.
Sent 2: Think about when you rub your hands together.
Sent 3: It is friction that makes them warm.
Sent 4: But why does this happen?
Sent 5: Friction causes the molecules on rubbing surfaces to move faster.
Sent 6: Faster moving particles have more heat energy.
Sent 7: Heat from friction can be useful.
Sent 8: Can you think of other places where you might find friction?
Sent 9: Friction also lets you light a match.
Sent 10: Heat from friction can also cause problems.
Sent 11: It can cause a car to overheat.
Sent 12: To reduce friction, oil is added to the engine.
Sent 13: Oil coats the surfaces of moving parts.
Sent 14: This coating of oil makes them slippery.
Sent 15: When things are slippery there is less friction.
Sent 16: Have you ever seen a sign that says, slippery when wet?
Sent 17: This too has to do with friction.
Sent 18: Water, like oil, can reduce friction.
Sent 19: The wet surface may allow your shoes to slide more easily.
Question: What can be done to prevent friction problems in engines? (A) Slippery (B) Add oil (C) Water is added to the engine (D) Add water (E) The surfaces of moving parts can be coated in oil (F) Antifreeze is added to the engine (G) It is coated with sand (H) Oil is added to the engine.

SOLUTION:
B, E, H.