John lost his ______ and fell from the ladder.

He caused a false account of the event ______ in the newspaper.

Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snow blindness, when exposed to several hours of 'snow light'. The United States Army has now determined that glare from snow does not cause snow blindness in troops in a snow-covered country. Rather, a man's eyes frequently find nothing to focus on in a broad expanse of barren(荒芜的)snow-covered landscape. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs(模糊), then is obscured(使变模糊), and the result is total, even though temporary, snow blindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop scouring(急走)the snow-blanketed landscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow blind or lost. In this way the problem of crossing a solid white terrain is overcome.

I ______ thank you too much for all your help to my son while we were away from home.

Unfortunately I spill water ______ my assignment, so I had to print another copy.

Wal-mart, which is one of the largest American supermarket chains, ______ some of its store open 24 hours on Mondays through Saturdays.

Online education provides those who work full-time ______ opportunities to receive further education in their spare time.

—Look, here comes your dream girl. Invite her to dance. — ______ What if she refuses me?

It is estimated that the total of ______ from the country overseas will this year reach 150,000.

There are many major economic problems ______ to be addressed, so there is no point ______ the growth rate of this year now.

People improperly dressed will not be ______ to this hotel.

He wrote quite a few ______ because he loved to make people laugh.

In order to raise the productivity of this factory, the most important thing is to ______ about some major changes in the management.

His constant attempts to ______ his colleagues' achievement eventually caused his dismissal.

His writing is so ______ that we cannot clarify his ideas on first reading.

The club, ______ 25 years ago, is holding a party for past and present members.

How is it that siblings (兄弟姐妹) can turn out so differently? One answer is that in fact each sibling grows up in a different family. The firstborn is, for a while, an only child, and therefore has a completely different experience of the parents than those born later. The next child is, for a while, the youngest, until the situation is changed by a new arrival. The mother and father themselves are changing and growing up too. One sibling might live in a stable and close family in the first few years；another might be raised in a family crisis, with a disappointed mother or an angry father. Sibling competition was identified as an important shaping force as early as in 1918. But more recently, researchers have found many ways in which brothers and sisters are a lasting force in each others' lives. Dr. Annette Henderson says firstborn children pick up vocabulary more quickly than their siblings. The reason for this might be that the later children aren't getting the same one-on-one time with parents. But that doesn't mean that the younger children have problems with language development. Later-borns don't enjoy that much talking time with parents, but instead they harvest lessons from bigger brothers and sisters, learning entire phrases and getting an understanding of social concepts such as the difference between 'I' and 'me'. A Cambridge University study of 140 children found that siblings created a rich world of play that helped them grow socially. Love-hate relationships were common among the children. Even those siblings who fought the most had just as much positive communication as the other sibling pairs. One way children seek more attention from parents is by making themselves different from their siblings, particularly if they are close in age. Researchers have found that the first two children in a family are typically more different from each other than the second and third. Girls with brothers show their differences to a maximum degree by being more feminine than girls with sisters. A 2003 research paper studied adolescents from 185 families over two years, finding that those who changed to make themselves different from their siblings were successful in increasing the amount of warmth they gained from their parents.

When he first arrived at university, he was not sure whether he was supposed to scribble ______ every word out of the professor's mouth.

He gradually ______ that her parents had been right and his decision had to be modified.

On a hill 600 feet above the surrounding land, we watch the lines of rain move across the scene, the moon rise over the hills, and the stars appear in the sky. The views invite a long look from a comfortable chair in front of the wooden house. Every window in our wooden house has a view, and the forest and lakes seldom look the same as the hour before. Each look reminds us where we are. There is space for our three boys to play outside, to shoot arrows, collect tree seeds, build earth houses and climb trees. Our kids have learned the names of the trees, and with the names have come familiarity and appreciation. As they tell all who show even a passing interest, maple(枫树)makes the best fighting sticks and white pines are the best climbing trees. The air is clean and fresh. The water from the well has a pleasant taste, and it is perhaps the healthiest water our kids will ever drink. Though they have one glass a day of juice and the rest is water, they never say anything against that. The seasons change just outside the door.We watch the maples turn every shade of yellow and red in the fall and note the poplars'(杨树)putting out the first green leaves of spring. The rainbow smelt fills the local steam as the ice gradually disappears, and the wood frogs start to sing in pools after being frozen for the winter. A family of birds rules our skies and flies over the lake.