One group of palace guards (6) _______ off duty, and another troop arrives to replace them.

Is the tape-recorded sound of a large metal-stamping machine music? Are 4 minutes (1) _______ 3 seconds of silence music? Is the activity of reading a (2) _______ of hundreds of seemingly unrelated objects, activities, and states of mind music? Each of these “(3) _______”, as well as many other sounds (or nonsounds), has been copyrighted (4) _______ a musical composition, performed, and recorded in the 20th century. One of the legacies of 20th-century music is to have blurred the definition of music as (5) _______ before.

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.

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.

Stories about how people somehow know when they are being watched have been going around for centuries. However, few (1)________ have been made to study the phenomenon scientifically. Now, with the accomplishment of the largest ever research of the socalled staring effect, there is striking indication that this is a recognizable and (2)________ sixth sense. The research elaborates
thousands of kids. For the research, they stood with their eyes covered and with their backs to other youngsters, who were told to either stare at them or look away. The outcomes constantly revealed that the kids who could not see were able to (3)________ when they were being stared at. In total of 14.000 experiments (4)________ globally, the teenagers (5)________ sensed when they were being watched almost 81% of the time.

They do not need to carry students’ papers around with them any more. This is because online (5)______ allow students to electronically upload their homework for their teachers to read and mark. Of course, this also means that students can no longer use the excuse that the dog ate their homework!

(2) _______, many educators claim that since the legislation was passed federal spending has not increased sufficiently to meet the rising cost of new library technologies such as computer databases and Internet access.

Polluting the air, soil, and water can harm ecosystems. Building (3)_______ on rivers for electric power and irrigation can harm ecosystems around the rivers.

A surprising number of popular spectator sports, for example football or baseball, (1)______ in Europe or the USA in the nineteenth century. This did not happen by chance. It was the (2) ______ of changes in the way people lived in those places at that time. Until then, more people lived In the country than in towns. They worked in small groups and had no regular time off. All this changed with the growth of factories and industry in the nineteenth century, first in Europe and (3) ______. In the USA. For the first time, most people began to live in towns, and they found themselves with regular free time. They had more leisure time than ever before. This resulted in the need for organized entertainment. Suitable games developed or were invented, typically team games, in which the crowd could (4) ______ sides and become involved. This gave people some of the entertainment they need in their free time. The recent explosion in TV, with the introduction of satellite and cable channels, has caused an increase in (5) ______ for sports as entertainment. The money TV has broughtto games such as football, tennis and baseball means that spectator sports will certainly go on playing an important part in our lives.

During the last 400 years, most scientists have (1) ________on mathematics in their development of their inventions or discoveries. However, one great British scientist, Michael Faraday, did not make (2)__________of mathematics. Faraday, the son of a poor blacksmith, was born in London in 1791 and had no (3) _________beyond reading and writing. In 1812 Faraday was hired as a bottle washer by the great chemist Humphry Davy. Later, Faraday became a greater scientist than Davy, making the last years of Davy's life embittered (4) __________ jealousy. Faraday made the first  (5)__________motor in 1821, a device that used electricity to produce movement.

Obviously, if children are bent over their computer for hours, (4)_____ in some game, instead of doing their homework, then something is wrong.