Nowadays, WeChat is becoming     1    . No matter where we are, we always find people using WeChat around us.

    2     some people, there are lots of reasons for the popularity of WeChat. First of all, it is easy to use.     3    , WeChat is a wonderful platform for people to share a great deal of information. Meanwhile, using WeChat, you can also do group chats, WeChat pay, play online games, send lucky money and express your feelings and ideas more freely. On the other hand, some people argue that WeChat also has some disadvantages. When using WeChat, people may forget the time and some may even get addicted(上瘾) to it. This will     4     their work and study. At the same time, spending too much time on the screen does affect eye health, which may cause trouble.

As far as I know, everyone is supposed to use WeChat within limits. As a student, I think we should learn to     5     between schoolwork and hobbies.

When people are working or studying, some of them cannot focus (集中思想). It’s very easy to get lost in the technology around them, such as cell phones and iPads. How can you break the bad    1    ? “Forest,” a mobile phone app (应用程序), is here to help people stay focused. When you want to get some work done, you plant a seed (种子) in the app. Then it will grow when you put down the phone and     2     working. If you work for 30 minutes, it will grow into a colorful and healthy tree. However, if you leave the app to play a game or do something     3     on your phone, the tree will die.

Do you often go to the restaurant with your parents or friends? Most of the time we order more than we can eat. So restaurants always have leftover (剩下的) food. What is the     1     way to deal with it?

Five eighth-graders from Capital Day School, in the US, wanted to give it to people in     2     . They made an app to do it.

The app is     3     Waste Free America. It tells homeless people     4     restaurants within 16 kilometers have leftover food. It     5     a national app design competition in the US. The prize was $20, 000 (about 127, 000 yuan) and a trip to Orlando, Florida. Jared Winters is one of the app’s makers. His grandfather buys pizzas for him every Friday night. So he knows that there are many pizzas     6     at pizza stores.

During a trip to Chicago, he and his friends saw a lot of homeless people. They gave their leftovers     7     breakfast to a homeless man. The man was very     8     . That gave them the idea to make the app. In the     9     months, they started to work on the app with some engineers.

They hope     10     they can show their app to people in Orlando soon.

Wang Mengqiu, the inventor of Hover Camera（ 无人相机).was born in Guangzhou in 1982.He once    1     at Stanford University in the US. He became famous overnight because of the invention.

Compared to other cameras, Hover Camera has many advantages. It can fly and stay in mid -air, track(追踪)your face and even follow you to make sure it    2     the perfect picture. What's more, it can     3     by using a smartphone. So, it is the best choice for weddings, sports games and holidays.

It's reported that the company     4     25 million to produce it by now. As it is still being tested, Hover Camera can be bought later this year. The price has not yet been decided. But a spokesman says the company hopes    5     it for less than $600.

Scientists have always wanted to know more about the other world in space. They have looked at it though telescopes and     1     they have found out a lot. But they want to know more about it. They only way to     2     more is to send men to the moon. Then they will know all about it.

The moon is about 184,000 kilometer away from the Earth. An ordinary plane cannot fly to the moon     3     there is no air above 240 kilometers in space. But there is     4     that can fly when there is no air. This is a rocket.

I’m sure that you will ask, “How does a rocket fly?” If you want to know, get a balloon and blow it up, until it is quite big. Don’t tie up the balloon, and let it go. It rushed out through the next of the balloon and this pushed the balloon into the air. It does not need     5    .