1.
In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis

2.
Archaeologists in Ireland believe that a recently discovered chalice, which dates from the eighth century, was probably buried to keep it from being stolen by invaders

3.
The recent surge in the number of airplane flights has clogged the nation's air-traffic control system, leading to a 55-percent increase in delays at airports and prompting fears among some officials that safety is being compromised.

4.
Referring to the current hostility toward smoking, smokers frequently express anxiety that their prospects for being hired and promoted are being stunted by their habit.

5.
Being heavily committed to a course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear.

6.
Frameed by traitorous colleagues, Alfred Dreyfus was imprisoned for twelve years before being exonerated and freed. (B-p88-4)

7.
Revered by an ill-informed citizenry, the Duke of York was feted opulently for several months before being denounced and exiled. (E-P13-1)

8.
Because the enemy’s new ship is the quietest and therefore the most elusive submarine, it is being increasingly viewed by the military as a threat to security. (A-P1-162)

9.
The computer software being designed for a project studying Native American access to higher education will not only meet the needs of that study, but also have the versatility and power to facilitate similar research endeavors. (D-P10-15)

10.
The herbicide Oryzalin was still being produced in 1979, three years after the wives of workers producing the chemical in Rensselaer, New York, were found to either to have had miscarriages or to have borne children with heart defects; none of the pregnancies was normal. (A-P1-19)

11.
Cooperative apartment houses have the peculiar distinction of being dwelling that must also operate as business. (A-P1-126)

12.
During the recession of 1973, home mortgage foreclosures resulted in tens of thousands of Americans being evicted from homes for which they could no longer afford monthly payments. (A-P1-204)

13.
The federal government requires hospitals to tell Medicare patients that they have a legal right to challenge their discharge if they feel they are being sent home prematurely. (A-P1-205)

14.
The company is negotiating to sell its profitable credit card subsidiary and plans to use money from that sale to acquire some of the mortgage-servicing operations that are being sold by troubled savings institutions. (D-p78-16)

15.
Without hearing a word of what is being said or shouted, experienced traders on the floor of the stock exchange can listen to the hum of voices around them and tell what is happening. (A-P1-122)

16.
During the 1950s, as part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling, so that they could learn to fall without being hurt. (E-P42-10)

17.
Bob Wilber became Sidney Bechet’s student and protégé when he was nineteen and, for a few years in the 1940’s, came as close to being a carbon copy of the jazz virtuoso in performance as anyone has ever come. “现目前为止”

18.
Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh refused to carry even a pound of mail, despite being offered $1,000 to do so.

19.
After more than four decades of research and development, a new type of jet engine is being tested that could eventually propel aircraft anywhere in the world within two hours or help boost cargoes into space at significantly lower costs than current methods permit.

20.
Simply being genetically engineered does not make a plant any more likely to become an invasive or persistent weed, according to a decade-long study published in the journal Nature.

21.
Performing a risky maneuver that required precision flying, space shuttle astronauts retrieved an orbiting satellite and simultaneously avoided being rear-ended by a passing ultraviolet telescope.

22.
According to one expert, the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria as that the breeds have relatively few founding members.

23.
The survival of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae, is being threatened, experts say, not only by pollutants such as agricultural runoff, oil slicks, and trash, but also by dropped anchors, probing divers, and global warming.

24.
Lenders and building managers in the southwestern section of the city report that because of the renewed rental market in the area and the increased willingness of banks to lend money, apartment buildings are being rehabilitated at a pace unseen for a decade.

25.
A mixture of poems and short fiction, Jean Toomer's Cane has been called one of the three best novels ever written by
a Black American—the others being Richard Wright's Native Son and Ralph Ellison's Invisible Man.

26.
A new hair-growth drug is being sold for three times the price, per milligram, that the drug's maker charges for another product with the same active ingredient.

27.
Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh refused to carry even a pound of mail, despite being offered $1,000 to do so.