This means that after a while your body becomes     1     to having nicotine in it. So when the drug leaves your body, you get withdrawal symptoms. I remember feeling bad-tempered and sometimes even in pain. Secondly, you become     2     through habit. As you know, if you do the same thing over and over again, you begin to do it     3    .

There is no doubt that the earth is becoming warmer and that it is human activity     4     has caused this global warming rather than a random but natural     5    . All scientists     6     to the view that the increase in the earth’s temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.

Having experience quite a few earthquakes in Hawaii already, I didn’t take much notice. I was about to go back to sleep     7     suddenly my bedroom became as bright as day. I ran out of the house into back garden where I could see Mount Kilauea in the     8    . There had been an     9     from the side of the mountain and red hot lava was     10     hundreds of meters.

In fifteen terrible seconds a large city lay     1    . The suffering of the people was     2    . Two-thirds of them died or were     3     during the earthquake. Thousands of families were killed and many children were left without parents.

The sound of planes could be heard     1     the city of Tangshan even when no planes were in the sky. In the city, the water pipes in some buildings     2     and burst. But the one million people of the city, who thought     3     of these events, were asleep as usual.

Later that afternoon, another big quake which was almost as strong as the first one shook Tangshan. Some of the     1     workers and doctors were     2     under the ruins. More buildings fell down. Water, food, and     3     were hard to get. People began to wonder how long the     4     would last.

I wonder if it’s because I haven’t been able to be     1     for so long that I’ve grown so crazy about everything to do with nature. I can well remember that there was a time     2     a deep blue sky, the song of the birds, moonlight and flowers could never have kept me spellbound. That has changed     3     I was here.

…For example, one evening when it was so warm, I stayed awake on     4     until half past eleven in order to have a good look at the moon by myself. But as the moon gave     5     too much light, I didn’t dare open a window. Another time five months ago, I     6     to be upstairs at dusk when the window was open.

I didn’t go downstairs until the window had to be shut. The dark, rainy evening, the wind, the thundering clouds held me     7     in their power, it was the first time in a year and a half that I’d seen the night face to face…

…Sadly…I am only able to look at nature through dirty curtains hanging before very     8     windows. It’s no     9     looking through these any longer because nature is one thing that really must be     10    .

Perhaps the most extraordinary building of the nineteenth century was the Crystal Palace,     1     was built in Hyde Park for the Great Exhibition of 1851. The Crystal Palace was different from all other buildings in the world,     2     it was made of iron and glass. It was one of the     3     buildings of all time and a lot of people from many countries came to see it. A great many     4     were sent to the exhibition from     5     parts of the world. There was also     6     great deal of machinery on display. The most wonderful piece of machinery on show was Nasmyth’s steam hammer. Though in those days, travelling was not as easy as it is today, steam boats     7    thousands of visitors across the Channel from Europe.     8     arriving in England, they were taken to the Crystal Palace by train. There were six million visitors in all, and the profits from the exhibition     9     to build museums and colleges. Later, the Crystal Palace was moved to South London. It     10     one of the most famous buildings in the world until it was burnt down in 1936.

Animals are important     1    （自然资源）. Animals have been killed for their     2    （毛皮）or     3    （羽毛），for food and so on. Now people hunt animals,     4    （砍倒）tress and     5    （破坏）their    6    （栖息地）. So the number of the wild animals is     7    （减少）. Many wild animals are in danger of     8    （灭绝）. We should raise awareness of protecting     9    （野生动物）and live     10    （和谐相处）with them.

In the past hundred years, there have been violent natural disasters occurring worldwide, such as     1    （洪水）,     2    （干旱），mudslides and     3    （地震）. The disasters have caused millions upon millions of people deaths,     4    （毁坏）countless homes, and wiped out numerous pieces of fertile land.

Now more and more people become aware that what we have done have done damage to the earth. So it is     5    （紧急的）for us to stop damaging it, and to do our best to     6    （保护）it, for we have nowhere to go and survive except where we are now.

Many animals move from one place to another at certain times of the years,     1     is called migration. They migrate to find food, seek a partner, or in search of warmer weather.

Every autumn,     2    （million）of the North American monarch butterflies begin a long and difficult journey. They manage to travel around 4,000 kilometers south and get to California or Mexico. However, how they did this was unclear.

A team of scientist has now found that the monarch is able to tell the time of day. It uses its eyes     3    （measure）the position of the sun. It uses the time of day and the point of the sun to determine the way to go and change its     4    （direct）. Eventually, it manages to reach the place     5     it will spend the winter.

In the last few years its population     6    （crash）significantly.     7    （sad），human activity is the main reason why the number of monarch butterflies is falling.

People cut     8     trees and use chemicals, which destroys the natural environment.

The research on the monarch’s behaviour has lead to a greater     9    （aware）of this creature. There may come a time when the number of monarch butterflies increases once again. The     10    （much）we know about this lovely creature, the greater the chance it will survive.

Daisy smiled. "That's good news. It shows the     1    of wildlife protection, but I'd like to help as the WWF suggested." The carpet     2     again and almost at once they were in a thick forest. A monkey watched them as it     3     itself. "What are you doing?" asked Daisy. "I’m     4     myself from mosquitoes," it replied. "When I find a millipede insect, I rub it over my body. It contains a     5     drug which     6     mosquitoes. You should pay more     7     to the rainforest     8     I live and     9    how the animals live together. No rainforest, no animals, no drugs."

Daisy was amazed. "Flying carpet, please take me home so I can tell WWF and we can begin producing this new drug. Monkey, please come and help." The monkey    10    . The carpet flew home.