As David finished the last drop of the delicious chicken soup, he licked his lips and gave out sounds of ______.

After several rounds of intense fighting, the boxer punched his ______ right in the face, knocked him out, and won the match.

Watch out! The bench has just been painted. You can fan the wet paint if you want to ______ its drying.

Warm milk ______ sleepiness. So if you have trouble falling asleep, try drinking some warm milk before going to bed.

Having worked five years as a data processor in a small town, Alice is tired of the routine of her job and the ______ of her life.

Peter has never been on time to meetings or appointments. It would be interesting to look into reasons why he is ______ late.

The film Life of Pi won Ang Lee an Oscar in 2013 for Best Director—one of the most ______ awards in the movie industry.

According to environmental scientists, the earth is likely to experience significant ______ changes within the next century.

Traditional Chinese medical practices include ______ remedies, which use plants, plant parts, or a mixture of these to prevent or cure diseases.

The French government has passed a bill that will   11   the use of excessively skinny models. Modeling agencies violating the law can receive a fine of up to US$81,000, with up to six months in jail for staff involved.

Modeling agencies violating the law can receive a fine of up to US$81,000, with up to six months in jail for staff involved. According to French officials, the measure aims to   12   the glorification of dangerously thin models.

Under the approved legislation, models will have to present a medical   13   that proves they are healthy before being allowed to work in the fashion industry.

Under the approved legislation, models will have to present a medical certificate that proves they are healthy before being allowed to work in the fashion industry. Moreover, they will be   14   regular weight checks.

Modeling agencies will have to produce a medical report showing that their models have maintained a   15   body mass-to-height ratio. This bill is expected to change young women’s view on the ideal female form.

One factor that separates a living thing from an inanimate object is the organism’s ability to carry out chemical reactions that are crucial for its survival. Imagine the infinite amount of reactions that a large organism such as human carries out every single day.   16   of these reactions are possible without enzymes.

Enzymes consist of various types of proteins that work to drive the chemical reactions   17   for certain types of nutrients to take effect. Enzymes can either launch a reaction or speed it up.

Enzymes can either launch a reaction or speed it up. In the absence of enzymes, reactants may take hundreds of years to convert into a usable product, if they are able to do so  18  . This is why enzymes are crucial in the sustenance of life on earth.

This is why enzymes are crucial in the sustenance of life on earth.

Enzymes,   19  , do not always function perfectly.

In 1902 Sir Archibald Garrod was the first to attribute a   20   to an enzyme defect, which he later referred to as an “inborn error of metabolism.”

Hundreds of years ago, a savory idea—called the century egg—was hatched in rural China. As the story goes, a farmer found naturally preserved duck eggs in a muddy pool of water and slaked lime. After surviving a tasting, he set out to replicate them manually, resulting in a   21   that would endure for centuries as a comfort food in Hong Kong, China and parts of Southeast Asia.

Though details of the century egg’s discovery are undocumented, scientists estimate that it   22   more than 500 years to the Ming Dynasty.

And aside from some techniques used for large-scale production today, the egg preservation process has remained relatively   23  .

To make the eggs, a vat is typically filled with a combination of strong black tea, lime, salt and freshly burned wood ashes, and left to cool overnight. The next day, duck, quail, or chicken eggs are added to the  24  .

The next day, duck, quail, or chicken eggs are added to the mixture. Then they soak anywhere from seven weeks to five months—not for a century as the name   25  .

The century egg also   26   many other names, such as hundred-year egg, thousand-year egg, or millennium egg.

But no matter what it’s called, this common snack has a rather uncommon taste and is often grouped by travelers with other   27   Asian foods such as chicken feet or snake soup.

Getting beyond the egg’s appearance is the first   28  . Instead of being white with a bright orange yolk, the jelly-like egg takes on a less appetizing dark brown and swampy green hue.

Instead of being white with a bright orange yolk, the jelly-like egg takes on a less   29   dark brown and swampy green hue. There’s also a pungent ammonia-like odor to contend with, which has earned the snack yet another nickname: the “horse urine egg.”

While the century egg draws a following from older generations and curious travelers, it is falling out of   30   with the younger set, who are weary of China’s preserved and fermented foods. The future of the humble snack is uncertain, but chefs in Chinese restaurants are still trying to preserve this nostalgic bite of culinary heritage.

The situation is very different for a starfish. If a starfish loses an arm, it can grow a new one.  31   Snails can even regrow their heads—imagine what the world would be like if humans could do that.

Snails can even regrow their heads—imagine what the world would be like if humans could do that. But we can’t. Nor can we grow new limbs or even fingers. That’s why scientists are studying animals that can regrow body parts, that is, regenerate.   32 

 A cockroach can grow back a missing limb, but the limb itself can’t generate a new cockroach.   33   Bidirectional regeneration, on the other hand, refers to a situation in which splitting of an animal will result in separate fully functional animals.

Bidirectional regeneration, on the other hand, refers to a situation in which splitting of an animal will result in separate fully functional animals.  34   Cut a hydra in half, and you’ll get two hydras. Cut it into four pieces, and you’ll get four.

  35   A single one can be cut into hundreds of pieces and each will grow back into a whole in a week or so. Because of this remarkable ability, one planarian can be created over and over, giving it a sort of immortality.