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.

You need to figure out how many calories you need in a day and how many you actually (2)______.

At many independent schools in England, you will be encouraged to take part (4)_____ extracurricularactivities to develop your hobbies and learn new skills, and you may be encouraged to take graded music exams (5)______ by the Associated Board of the Royal Schools of Music.

We are all too dismissive of traditions in our modern world, but they can have very strong pull (5)_____ us.

A. reminders
B. notes
C. bills
D. checks

I had never been to Denmark before, so when I set out to catch the ferry in early May, I little suspected that by the end of the trip I'd have made such lasting friendships. Esjberg is a (1) ________ port for a cyclist's arrival, where tourist information can be obtained and money changed. A cycle track leads (2) ________ town and down to Ribe, where I spent my first night. The only appointment I had to keep was a meeting with a friend who was flying out in June. I wanted to use my time well, so I had planned a route which would include several small islands and various parts of the countryside. In my (3) ________, a person travelling alone sometimes meets with unexpected hospitality, and this trip was no (4) ________. On only my second day, I got into
conversation with a cheerful man who turned out to be the local baker. He insisted that I should join his family for lunch, and, while we were eating, he contacted his daughter inOdense. Within minutes, he had (5) ________ for me to visit her and her family. Then I was sent on my way with a fresh loaf of bread to keep me going and the feeling that this would turn out to be a wonderful holiday.

It can take a long time to become successful in your chosen field, however talented you are. One thing you have to be aware of is that you will face criticism along the way. The world is full of people who would rather say something negative than positive. If you’ve made up your (1)______ to achieve a certain goal, such as writing a novel, don’t let the negative criticism of others prevent you from reaching your target, and let the constructive criticism have a positive effect on your work. If someone says you’re totally in the (2)_______ of talent, ignore them. That’s negative criticism. If, (3)________, someone advises you to revise your work and gives you a good reason for doing so, you should consider their suggestions carefully. There are many film stars who were once out of work . There are many famous novelists who made a complete mess of their first novel – or who didn’t, but had to keep on approaching hundreds of publishers before they could get it
(4)_______. Being successful does depend on luck, to a certain extent. But things are more likely to (5)_______ well if you persevere and stay positive.

(5)______ , there have been some developments recently. Sensors are available to help the robot locate objects and avoid obstacles. We have the technology to produce the hardware. All that is missing the softwarethe programs that will operate the machine.