This article (1) _______ on the game of American football, a distinct type of football that developed in the United States in the 19th century. It developed out of two other sports, soccer (2)_______
known as association football) and rugby football, each of which remains a separate sport with its own specific set of rules. American football differs slightly in (3) _______ and field size from a style of football (4) _______ mostly in Canada, called Canadian football. Other varieties of the game popular in (5) _______ parts of the world have Australian football and Gaelic football.

In fact, chess almost certainly originated in India in the sixth or seventh century AD. The game’s popularity then spread quickly through Persia (now known as Iran) and from there came to Europe. It is (3)_______ that the word ‘chess’ comes from ‘shah’, the Persian word for ‘king’ and that ‘checkmate’

The nationwide Citizens Advice Bureau, which offers free advice to the public on a wide range of issues, is run mainly by volunteers, and the Blood Transfusion Service relies on voluntary blood donors to give blood for use in hospitals. Political parties use volunteers at election time, and Churches depend on volunteers to (5) _______ building clean.

A rainbow is an optical display of color that usually appears in the sky when a beam of sunlight refracts through millions of raindrops. Each (1)________ color from the spectrum is then sent to your eyes. For this to happen, the angle between the ray of light, the raindrop and the human eye must be between 40 and 42 degrees. After studying rainbows in (2)________, Sir Isaac Newton was able to explain how they are formed. However, he was color blind, so he had to rely on the eyes of his assistant, who could easily (3)________all the seven colors: red, orange, yellow, green, blue, indigo and violet. His assistant could also clearly tell the difference between indigo and violet. There are two types of rainbows. Primary rainbows are the most common and have the most distinctive colors, with red appearing on the outside of the arc and violet on the inside. Secondary rainbows are unusual because the light is reflected twice within the raindrop before it (4)________ a rainbow, so the colors are in reverse order and not as bright as primary rainbows. There is a popular myth that if you reach the end of a rainbow, you will find a pot of gold waiting for you. In fact, it is impossible to do this, because a rainbow has no end - as you go towards the point where the rainbow seems to touch the ground, it moves away from you as quickly as you (5)________.

After studying rainbows in (2)________, Sir Isaac Newton was able to explain how they are formed.

British families started going on holiday to the seaside around the middle of the 19th century. The invention of the railways made this possible. The first holidaymakers were quite rich and went for their health and education. The seaside was a place to be (1)__________of illnesses, and doctors recommended bathing in the sea and drinking sea water. Also to increase their knowledge, families attended concerts and read books from libraries. At that time, ordinary working people had very little time (2)__________. However, in 1871, the government introduce four “Bank Holidays” – national holiday days. This allowed people to have a day or two out, which now and then gave them a taste for leisure and the seaside. At first they went on day-trips, taking (3)__________ of special cheap tickets on the railways. By the 1880s, rising incomes meant many ordinary workers and their families could have a week’s holiday at the seaside. Rail fares were reduced and cheap hotels were built to (4)__________ them. Holidaymakers enjoyed being idle, sitting on the beach, bathing in the sea, and eating ice-cream. Cheap entertainment was (5)__________ offer and holidaymakers went to have fun. Today, the English seaside remained popular, with more than 18 million holidays taken there each year.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too (1)____ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds (2)_____. Polluting the air, soil, and water can harm ecosystems. Building (3)_______ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down (4)________ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people (5)________ causing harm to ecosystems

Research has shown that over half the children in Britain who take their own lunches to school do not eat (1)______ in the middle of the day. In Britain schools have to (2)_____ meals at lunchtime. Children can choose to bring their own food or have lunch at the school canteen. One shocking finding of this research is that school meals are much healthier than lunches prepared by parents. There are strict (3) ___ for the preparation of school meals, which have to include one (4) ___ of fruit and one of vegetables, as well as meat, a dairy item and starchy food like bread or pasta. Lunchboxes (5) ___ by researchers contained sweet drinks, crisps and chocolate bars. Children consume twice as much sugar as they should at lunchtime.

Another common superstition is that it is unlucky to open an umbrella in the house - it will either bring (4)______ to the person who opened it or to the whole (5) ______. Anyone opening an umbrella in the fine weather is unpopular, as it inevitably brings rain

Such education becomes (4)___ important as people gain more and more leisure time. Education also helps people adjust to change.v

Burning 250 or 500 calories per day can make a big (4)_____ .