Food is broken down and converted into energy in the ………. system.

Choose the best option to complete the following sentences.

While Tom……………English to poor children in Phnom Penh last year, he………………a lot about Cambodian culture.

Listen to the radio interview about improving your memory and do the exercises to practise and improve your listening skills.

Are the following True or False?

How to improve your memory

Question 1. We all use memory in the same way.

Question 2. We learn to use our memory as soon as we are born.

Question 3. There are two different forms of memorisation.

Question 4. We are taught how to improve our memory in history lessons.

Question 5. Writing shopping lists can improve your memory.

Question 6. Teaching helps us to memorise.

Question 7. We can train our brains to be more effective.

Read the passage and do the tasks that follow.

Li-Fi Technology

Li-Fi technology is a new technology that transmits signals as light instead of radio waves. In urban areas where Wi-Fi networks become congested and there is a lot of noise in the signals, this technology is something that can be of immense use to an individual. The basic requirement of this technology is the available of light!

Light is also an electromagnetic wave like radio waves. The only difference is that the former has the ability to transmit data almost ten thousand times faster than latter! The basic process is quite simple to understand. An LED light bulb, any one at all, can be flicked on and off in order to be able to generate signals. A light sensor on a device picks up the digital information sent by the LED, which enables it to be processed by a computer.

The question is whether anyone wants to go through the annoying experience of sitting under a flickering light bulb. This is the interesting part. The technology is focusing on make sure that the light bulb is flickered up to billions of times a second! At that rate, the human eye simply cannot notice the light bulb being flicked on and off.

However, everything comes with a disadvantage. The major disadvantage here is the fact that these signals cannot penetrate walls. So if you want to move from one room to another, you will need to have a wired bulb present in that room as well.

An Estonian startup company called Velmenni took the technology out of the laboratories and brought it into the real-world offices, and industrial environments in Tallinn for the first time.

Overall, this sounds like quite a development in the field of communication technology.

Read the passage, and then decide whether the statements are true (T) or false (F)

1. Li-Fi is similar to the Wi- Fi except that it uses light waves instead of radio waves.

2. The speed generated by Li-Fi can be up to ten thousand times greater than the average Wi-Fi

3. No one wants to go through the annoying experience of sitting under a flicking light bulb.

4. It is convenient for you to use Li-Fi to transmit signals when you move to various rooms in the building.

5. The technology of Li-Fi has several of advantages in theory, but we cannot put into practice.