The Truth about Global Warming
More and more teenagers are worried about the environment. Teen World takes a look at the biggest environmental problem facing our world.
Teens everywhere are (1) . The main issue today is global warming. It's caused by the increase of greenhouse gases, which keep the heat from the sun in the air. Sulfur dioxide (SO2) is one of the most common greenhouse gases. It (2) . We consume fossil fuels for our transportation and the energy in our homes. Deforestation is another human activity that only makes global warming worse. Trees remove greenhouse gases from the air, so we need to protect the forests.
What can we do? First of all, in order to reduce greenhouse gases, we should shut down coal and of power plants. (3) , such as wind and solar power, even if they cost more. Instead of gas, we could switch to using biofuels, (4) . Secondly, we should prohibit cars and motorbikes from downtown areas and increase the tax on gas to make it more expensive to use them. Using more electric vehicles, especially electric buses, is another good idea.
Protecting our forests and (5) are both very important. It's hard to stop farmers from cutting down trees, so governments have to make strong laws to protect forests.
There are many things we can do at home to help. We can all help save energy at home by turning off the lights and also switching to energy-saving devices.
These are the solutions we can use to stop global warming. We can still save our planet if people act now.
(Adapted from Tieng Anh 11 i-learn smart world)

Future Cars: The Road Ahead
Future cars, once a vision of science fiction, are now entering the stage of reality. The self-driving car, for example, (6) . After a successful test drive in California, it has been tested in multiple countries, including the UK and Japan. In these countries, the car has demonstrated its ability to navigate busy streets without human intervention. In 2023, the self-driving car was granted approval for use on public roads in several regions. The self-driving car is the latest innovation by a leading automobile company (7) . With cutting-edge research in artificial intelligence, engineering, and automation, this company has led the way in developing autonomous vehicles. (8) . The car’s design draws inspiration from both futuristic concepts and the latest advancements in safety features. (9) . The car’s outer shell is made of lightweight materials, contributing to both efficiency and strength. The car also uses advanced sensors and cameras to monitor its surroundings. With machine learning algorithms, (10) .

Do you think animals can predict the weather or other natural events? Farmers living in the countryside think so. For hundreds of years, they have observed animals and noticed many things about the way animals act. (11) . Or, when cows lie down, a rainstorm is coming. There are many traditional stories (12) . Some scientists are taking another look at animals to see if there is any truth behind these stories and beliefs. They have found some surprising things.
Kiyoshi Shimamura is a Japanese earthquake researcher. He noticed an increase in dog bites a short time before earthquakes hit. (13) . These health centers treated people after a big earthquake. Shimamura noticed that the month before the big earthquake, (14) . In fact, aggressive behavior in dogs, such as biting and barking loudly, jumped 60 percent!
Other animals change their behavior before an earthquake as well. For example, fish in ponds or lakes begin swimming together in large groups only in the middle of the water and not near the edges. Also, birds may fly away from their nests for many days, leaving their eggs unprotected. These behaviors suggest that (15) .
(Adapted from Reading Challenging 1)