With the development of society, chemical pesticides and artificial fertilisers have been in     1     use in farming for many years. They can help fight crop     2     and increase production. However, they can cause many problems     3    . For instance, pesticides can kill     4     bacteria and insects and crops grown with chemical fertilisers usually grow     5     to be full of nutrition. As a result, many people worry they may make them ill and even cause cancer.

To tackle this problem, farmers use natural waste as     6     and they often change the kind of crop grown in each field every year and they also plant diverse crops that use different     7     of soil to help keep it rich. But organic farming is nowhere near able to     8     the high demand for food. Therefore, there is still a long way to find a     9     solution that puts sufficient food on the dinner table while keeping people and the environment as     10     as possible.

The Earth is made up of three layers. In the centre is the core, which is as big as the Mars and has a high     1     of over 7,000˚C.     2     the core is a thick layer called the mantle,     3     lower part is solid rock,     4     portion is molten rock called the magma. Floating on top of the magma is the Earth’s rocky crust.

The crust is made up of tectonic plates. These huge plates are moved slowly by magma currents below, sliding past each other with     5    . If a plate is forced down     6     another and gets     7    , pressure will build up until the stressed rocks suddenly     8     apart, causing     9     ground movements called earthquakes. The point where the rocks suddenly jolt or break is called the epicentre, from which, powerful shock waves     10     out in all directions.

Daisy smiled. “That’s good news. It shows the     1     (important) of wildlife protection, but I’d like to help as the WWF suggests.” The carpet rose again and almost at once they were in a thick rainforest. A monkey watched them as it     2     (rub) itself. “What are you doing?” asked Daisy. “I’m protecting myself     3     mosquitoes,” it replied. “When I find a millipede insect, I rub it over my body. It     4     (contain) a powerful drug     5     affects mosquitoes.”

But    1    . Soon after the quakes the army sent 150,000 soldiers to Tangshan to    2    and to bury the dead. More than 10,000 doctors and nurses came to    3    . Workers built shelters for survivors    4    . Hundreds of thousands of people were helped. Water and food were brought into the city by train, truck, and plane. Slowly    5    again.

Tangshan started to    6    . With strong support from the government and the    7    of the city's people. a new Tangshan was built upon the earthquake ruins. The new city has become    8    more than seven million people, with great improvements in transportation, industry, and environment. Tangshan city has proved to China and the rest of the world that    9    , people must unify and show the wisdom to     10    .

I have the greatest job in the world. I study     1     (volcano) and I travel to     2     (usual) places and meet interesting people from all over the world. I am never bored. I find that the volcano eruption     3     (it) is really exciting     4     (watch) and I should never forget my first sight of one. It was in the second week after I arrived in Hawaii.     5     (work) hard all day, I went to bed early. I was fast asleep when suddenly my bedroom began shaking and I heard a strange sound, like a railway train passing my window. Having experienced quite a few earthquakes in Hawaii already, I didn’t take much notice. I was about to go back to sleep     6     suddenly my bed room became as bright as day. I ran out of the house into the back garden     7     I could see Mountain Kilauea     8     the distance. There had been an eruption from the side of the mountain and red hot lava was     9     (fountain) hundreds of meters into the air. It was     10     absolutely fantastic sight.