In October, which is early spring in the Antarctic, penguins _______the water and walk over sea ice to their breeding grounds.

My sister waded through the ______while her friend read, but they both stopped to listen when two thrushes called to each other.

Monte has taken up rock-climbing with Bill Ramsey who squeezes in biology teaching when he isn't climbing _____.

The first thing she saw was this charming girl in the ____, in her black hat trimmed with gold daisies, and a long black velvet ribbon.

Emily Dickinson loved nature and took long walks with her dog especially in the fall when the hills, as she said, "put on their _____ shawls."

The Great Barrier Reef, which curves around the Australian shore for 150 miles, is the most extensive_____ever developed by man or animal.

Mr. Olta was a landscape gardener who had built up a very good _____for being reliable and the possessor of an excellent green thumb. 

When the stationmaster stepped out of the little brick station with its pointed chalet roof, a sudden gust of wind _____ the legs of his uniform.

Before the ballet _____began, Dora worried about what her state of mind should be, and whether panic would crowd out the well-practiced steps and her emotions as she danced.

Having been assured that I would indeed find life congenial, practical and entertaining _____ under the sea, I eventually took the plunge and moved down.

Explorer 14, a tiny satellite _____ above the Earth, had picked up signals coming from an object in our galaxy billions of miles away.

All snakes possess the trait of _____ their skins at more or less regular intervals by turning the skin inside out in the act of discarding it.

Some people believe there is nothing one person can do against the world's ills, yet many of the world's great movements, thoughts and actions have flowed from the work of a _____ person.

Geology, which is the study of the Earth's composition, was given its name in 1830 by Sir Charles Lyell whose _____ and observations contributed greatly to the field. 

Here I was minding my own business, being Mr. Polite, when Cannonball comes into the room and _____ out in a loud voice, " Have you seen my brother, the guy with the two heads?"

For forty years the elderly Madame Vandor has kept a three-story boarding _____ in Paris, with a little garden guarded by the statue of Venus in the front yard and chickens and pigs in the back.

The establishment of national parks and reserves within the natural habitats of gorillas must be large enough to  _____ different troops of apes which need their own territory. 

Greenland, the world's largest island, has _____ from kayaks, dogsleds and igloos to diesel powered snow trains on skis and a city inside the icecap.

Did you ever consider what other people in the world were eating when you helped yourself to baked chicken or fish, or an equally _____ juicy hamburger or a second slice of cheesecake?

The water seeped through every crack of seemingly barren rock in tiny, finger-like trickles, which turned into giant _____ as they overran 

Knights had rules of behavior called the code of chivalry that included treating a captive as an honored guest, even if he has been a bitter _____, and never attacking another knight without warning.

_____ can improve the quality of good such as silicate added to salt or flour to prevent caking, or monoglycerides mixed with peanut butter to prevent the separation of oil and nuts. 

Edison's phonograph was a remarkably simple _____ of a metal needle attached to a thin vibrating sheet, which transformed sound waves into patterns on tinfoil wrapped around a grooved cylinder.

If properly managed, one acre of a crop of oysters, shrimp, mussels, or fish raised by shallow-water farming can _____ at least ten times more protein a year than an acre of pastureland.