CDI Aug 17, 2025
Task 1: Pie chart in the picture

Task 2: Many people think cheap air travel should be encouraged because it givers ordinary people freedom to travel further. However, others think this leads to environmental problems, so air travel should be more expensive in order to discourage people to have it. Discuss both sides and give your own opinion.

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CDI Aug 20, 2025
Task 1:
Bar graph in the picture

Task 2:
As major cities around the world are growing, so are their problems. What are these problems for young people living in cities? What are possible solutions for these problems


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The diagram illustrates the design and operation of an LED flashlight. Overall, the flashlight consists of three key components: a protective outer casing, a power supply, and a switch mechanism that controls the electric circuit.

Structurally, the flashlight is enclosed within a plastic outer case. Inside, two batteries are vertically stacked, with the lower one directly connected to a coiled spring at the base. This arrangement ensures that the components are aligned in a continuous path. At the opposite end, the LED bulb is positioned at the very top, ready to illuminate once power is transmitted.

Operation depends on the slide switch located on the side of the case. When pushed down to the “off” position, the circuit is interrupted, preventing the current from reaching the bulb. By contrast, pushing the switch upward closes the gap between metal contacts, thereby completing the circuit. As the arrows in the diagram indicate, this enables electricity to flow and results in the LED being lit.

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The diagram illustrates the design and operation of a hot air balloon.

Overall, the balloon consists of three main parts: a large fabric covering, a heating system, and a passenger container, and its movement is controlled by adjusting the air temperature inside the covering.

In terms of structure, the entire device is attached to a basket at the bottom by a set of ropes. A burner is placed between the basket and the fabric covering, which is made up of vertical and horizontal sections joined together. At the very top of this covering is a flap, which can be opened or closed to control the release of air.

The hot air balloon operates through its burner system. This mechanism mixes propane with air to produce flames that heat the air inside the fabric covering. As the air becomes warmer, it grows lighter, causing the balloon to rise. In contrast, opening the flap allows hot air to escape so that cooler, denser air replaces it, leading the balloon to descend.

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The diagram illustrates the design and operation of a modern landfill for household waste.

Overall, the landfill is built by lining a man-made pit with protective materials and installing drainage systems, after which household waste is deposited, decomposed, and eventually sealed, with liquids collected and gases released.

In terms of structure, the process begins with the excavation of a large hole in the ground above a natural rock foundation. The inner surface of the hole is first covered with clay and then with a synthetic lining. Within this layer, a drainage tank is placed at the bottom, connected to a network of pipes, to manage liquid by-products.

Turning to its operation, the landfill is filled with household refuse, which gradually decomposes inside. During this stage, liquid waste seeps down and is collected in the drainage tank, while gases are discharged through vertical pipes leading to the surface. Finally, once the pit is full, it is sealed with a clay layer on top, preventing further input of waste while still allowing controlled gas release.

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The diagram illustrates the natural process through which sand dunes are created, highlighting the role of wind, sand particles, and surface conditions.

Overall, the formation of dunes is driven by the movement of sand particles under the influence of wind, with dry sand being carried more easily than wet sand, and the accumulated particles gradually producing mounds that develop into dunes.

To begin with, when wind blows across a dry sandy surface, loose particles are lifted and transported forward. Since dry sand is light, it is readily moved by the airflow, while wetter sand particles tend to remain in place due to greater cohesion.

Subsequently, some of the moving sand becomes trapped when it encounters patches of wet or moist ground. This leads to small buildups of sediment that interrupt the smooth flow of particles. Over time, these deposits accumulate into a mound, while further grains continue to be added by the ongoing wind.

Ultimately, the mound enlarges as more sand is deposited behind it, resulting in the formation of a distinct dune. The cycle then continues, allowing dunes to expand steadily as long as wind and loose dry sand are available.

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Exam date: 
Task 1: Description and the picture if you can find one
Task 2: The statement and questions given

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