1     internet technology expanding every day, it is hard to keep up with the innovative software that keeps popping up on a regular basis.     2     Bitcoin was first introduced in 2009, it is still a relatively new player in the online payment system. What makes this internet payment network so special is its     3     (unique). It makes it possible to transfer Bitcoin currency from one peer to another quickly and effectively. The processing fees are very low and you can make worldwide payments in minutes.

Bitcoin is a digital currency that is bought, sold and transferred between fellow     4     (use) of the same payment network. The process begins when the prospective member downloads the software to their computer or phone. Once you     5     (complete) this process you will receive a Bitcoin address. The address is used to send you payments for goods or services rendered. This currency can also     6     (buy) on a market exchange. You can sell your bitcoins at this exchange as well. The unique thing about this payment network is that the currency is decentralized. It is not owned or controlled by any bank or     7     (finance) institution. It is not insured by the FDIC. It is open to anyone that wants to become a member. More and more merchants     8     (accept) this digital currency for their goods or services. There is no risk and the encryption process is very effective.

The following shows how the bitcoin works. You install a wallet on your computer or phone. You receive your new IP address. Then you begin accumulating bitcoins through purchase or transactions. All transactions on the payment network are stored in a Block Chain, which is nothing more than a     9     (share) public ledger. Bitcoins are transferred instantly and is verified mathematically by the network. Currency is transferred from one wallet to another quickly, safely, and securely. The Bitcoin mining process is     10     the transactions are constantly stored in the block chain and then verified by the computer.

Avatars are digital     1     (image) that you use to represent yourself online. The first simple avatars appeared in role-playing computer games in the 1980s and by the late 1990s they     2     (use )in online chats. People started     3     (create) their own avatars that didn't look or act like their real selves. Avatars let you express     4     (you) and they give you lots of room for creativity. Most people create avatars     5     have similar features to their personalities and that look more or less like them and act like them. In most web chats, people can choose an avatar     6     a selection of ready-made images, or create     7     (free) their own images. But the use of avatars has also caused a few concerns. Some users are     8     (worry) that they are spending so much time in virtual worlds that they are becoming afraid of meeting people in the real world. The use of several avatars can also be     9     risk, as people can use avatars     10     (cheat) others online. However, many people see avatars in a more positive light

With Tokyo Summer Olympics     1     (approach), reports indicate that facial recognition will be used as a security measure at those games. The Japan Times reported the technology would be used to “make the entry to the stadiums simple”.

While spectators (观众) won’t have to receive the     2     (treat), athletes, officials and journalists will be screened, according to the report of The Japan Times.    3     there were complaints of long waits, the organizing committee     4     (prove) the technology during the 2016 Summer Olympics in Brazil quite     5     (success). They hope to sort out the wait and other issues ahead of the Tokyo Games     6     will start in late July 2021.

NEC, the company handling the technology, also tested out their equipment at two airports and is behind a number of other similar projects,    7     (include) software used by the Chicago Police. This technology is becoming far     8     (popular) and the Olympics are just the latest area to use them     9     security purposes. Other examples of planned or in use include robot police in China, bridges and tunnels in New York City, and more widespread uses by the FBI. Also, the technology allows you     10     (use) your fancy new phone and order fast food.