Read the following article and select the best answer. Article: "Everybody loves a bargain." One person's useless, ugly, or broken object can be another person's bargain. That is why so many Americans do not throw things away. They put them outside their houses. They put on a "For Sale" sign. And, as simple as that, they have a yard sale. The sellers put a paid announcement in a local newspaper. It tells when and where the yard sale will take place. These sales are very popular during weekends in spring, summer, and autumn. Early in the morning, all the things to be sold are carried out of the house. Then they sit all day in the sunlight---like tired guests at a party---waiting for someone to take them home. Just about anything can be sold at a yard sale. Sometimes, there are more clothes than anything else. Cooking equipment is also popular. So are old toys, tools, books, tables and chairs. Then there are objects called "white elephants". A white elephant is something you think is extremely ugly or useless. It may be an electric light shaped like a fish. You feel a sharp pain whenever you look at it. To someone else, however, it might be a thing of beauty and joy. Some people go to yard sales to find a special thing that they collect. It may be old toy trains, for example, or painting of dogs. Experts say more Americans are collecting old things now than ever before. Most people who go to yard sales, however, are not looking for anything special. They might buy an object simply because it costs so little. They enjoy negotiating over prices, even if they really do not need the object. Later, they may hold their own yard to sell all the things they have bought. Question: A white elephant refers to _ . - something that can cause a feeling of pain - something disliked by the owners while appreciated by others - something sold at the lowest prices - a toy shaped like a fish
something disliked by the owners while appreciated by others

Read the following article and select the best answer. Article: After the "Big Bang ",the earth was just a cloud of energetic dust. What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun. The problem was that the earth became violent because it was not clear whether the solid shape was to last or not. It exploded loudly with fire and rock, which were in time to produce the water vapor, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth's atmosphere. As the earth cooled down, water began to appear on its surface. Nobody knew that it was going to be different from other planets going round the sun. Water had already disappeared from planets like Mars or satellites like the moon, but it stayed on the earth. This is how the earth began to show its special qualities. Many people think that this was important for the beginning of life. It allowed the earth to dissolve harmful gases, which had become part of the earth's atmosphere, into the oceans and seas. That made it possible for life to begin to develop. What scientists think is that the earth was different because of the arrival of small plants growing in the water on its surface. Nobody understood that these plants were the start of many changes. They multiplied and filled the first oceans and seas with oxygen .This encouraged the development of early shellfish and all sorts of fish. Many millions of years later the first green plants began to appear on land. Scientists believe that taking carbon dioxide from the atmosphere and filling the air with oxygen helped life to develop. Later land animals appeared. Some were insects. Others, called amphibians, were able to live on land as well as in the sea. When the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. Later, some huge animals, called dinosaurs, developed, They laid eggs too. They became the most important animals on the earth for millions of years. But when they disappeared, mammals became more important. They were the last... Question: What problem is caused by human beings? - They exist everywhere on the earth. - They cause global warming. - They find new methods of growing crops. - They enjoy hunting and fishing.
They cause global warming.

*Question*
Read the following article and select the best answer. Article: Earth is the third planet from the sun.It is one of the four inner planets.The other three inner planets are Mercury,Venus,and Mars.The inner planets are also called the rocky planets,because they are made of rocks. Earth is often called the "Water Planet",because it is the only planet in our solar system which has liquid water on its surface.About 70% of the surface of Earth is covered by water! The other part of Earth is made up of continents and islands which have different landforms on them.Examples of landforms are mountains and plains.Plants and animals can live on Earth,because it has so much water. Earth spins very quickly compared to other planets.It only takes Earth 24 hours to spin around its axis one time.One Earth day is 24 hours long!Earth orbits the sun in 365 days! This makes one Earth year 365 days long! Earth is the only planet in our solar system where humans,other animals,and plants can live.There is plenty of water to drink or to live in.Water is present on Earth in its big oceans and in the air! Clouds are made of water vapor.The atmosphere has a lot of oxygen in it for animals to breathe,but the rest of our "air" is made up of water vapor,nitrogen,carbon dioxide,and other gases.The air is perfect for plants to grow.Earth temperature is not the same in all places,but the temperature is just right for plants,animals,and humans in most places on Earth. Like the other inner planets,Earth has volcanoes.Volcanoes on Earth are different from those on other planets,because they still erupt.Scientists think that there may be active volcanoes on other planets and moons in our solar system,but they are still studying this. Earth has one planet which we call the Moon.The surface of the Moon has many craters on it These were caused when meteorites hit it.It has many volcanoes on it which do not erupt anymore.We can see the moon at night without using a telescope.It is the closest space object to our planet,Earth. Question: Life exists on Earth, _ . - because the water,air,and temperature are just right - there is water vapor in clouds - Earth is the planet closest to the sun - earth has volcanoes
**Answer**
because the water,air,and temperature are just right