All the people should do their best __________ their work.

A. to finish B. finish C. finished D. finishing

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New computers ___ all over the world.

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My brother often ________ TV. But now he ________ the house.

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________. Can you tell me the way to the Bird's Nest?

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When you wanted to buy something in the past, what would you do? You would go out and buy them in a store or supermarket. But now in 21st century, there is a new way to do－it is to buy it online. How incredible(不可思議), isn’t it?

There are many good reasons to shop online. First of all, it is convenient. When you want to buy something, you do not need to go out, but to sit before your computer and look through the web pages such as JOYO or EBAY. Then you choose what you want and buy it with just a click of your mouse. Shopping online can help you save lots of time, money and energy.

The advantage of shopping online is that there are much more goods online which you have never seen in the store. For example, some books printed several years ago might not be sold in the stores, but you can buy them online!

Finally, because of the technology improvement(技術(shù)改進(jìn)), shopping online has become safe. You can check the information of the owner before you decide to buy and pay for the goods. You can make payment online and you don’t need to worry that your information may be stolen.

If you want to enjoy shopping, you can choose online shopping to get what you want.

1.How did you buy something in the past according to the passage?

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Every time we turn on the TV or take a ride in a car, we could be adding to a problem called acid rain(酸雨). In this article, we’ll learn something important about acid rain.

The formation of acid rain

When people use fuels (燃料), such as coal and gasoline(汽油), poisonous gases are given off. When these gases come together with rain, acid rain forms. Many power stations burn fuels in order to create the electricity(電) that we use in our homes and offices every day. Cars and trucks also send these gases into the air when they burn gasoline. When rain meets these gases, harmful things called acids form. This is acid rain.

The harm of acid rain

Acid rain destroys everything that it touches. It poisons our rivers, ponds and lakes and oceans along with the life in them. It pollutes our soils and crops, harm trees, and can even kill fish and plants. Acid rain also eats away at our buildings.

The prevention of acid rain

We need to reduce and even stop the pollution that gets into our air. Turn off lights, televisions and other electrical appliances(電器) if we are not using them. Walk and take a bike whenever possible. If we are travelling a long distance, take a bus or train to save fuel.

As research shows, acid rain harms our environment. But people everywhere can take small steps now to help protect our environment for future generations.

Whenever we use electricity or drive our cars we may add something bad to the air around us. And even worse, we may cause a terrible problem—acid rain.
 

The formation of acid rain
 

When fuels, such as coal and gasoline are burnt, harmful gases are sent into the air. When these gases1.with rain, acid rain forms.
 

The harm of acid rain
 

Acid rain is greatly2.to the environment. It makes our rivers, ponds and lakes and oceans dirty and3.the death of fish and plants. And it can corrode (腐蝕) the buildings we live in.
 

The prevention of acid rain
 

Trying to prevent the pollution that gets into the air is4.. Keep the electrical appliances off while they are not in use. We can also use different ways of traffic to make less use of fuels.
 

Research tells us that acid rain harms our environment. So people around the world can take small steps now to make a5.to our kids.
 

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David is helping his mother prepare for the dinner. Look! He is ________ some dishes on the table.

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