阅读下面的短文，根据短文内容，从方框内所给11个动间中选择10个意义相符的词，必要时进行词形变化(可添加助动词或者情态动间)，填入空白处。
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On May17, China launched a new satellite at the Xiehang Satellite Launch Center. It was the forty fifth Beidou satellite that China had sent into space.
So what is Beidou? Beidou is a positioning system (定位系统). It by China. China is the third country in the world to have its own positioning system. By Beidou, China no longer has to depend on foreign systems. This is very important for national safety.
Work on Beidou in 1994. However, the first two Beidou satellites were not sent into space until 2000. Since then, China has launched dozens of Beidou satellites. These satellites have formed a global net work. Now, China is further improving the system. It plans into the space ten more Beidou satellites. If everything well, Beidou will be completed before 2020.
The completed Beidoumore powerful than any other positioning system. Yang Changfeng is a designer of Beidou. He says the system the sway(摇摆) of a building in strong winds.
So far, Beidou much benefit(福利) to our lives. In many cities, thousands of buses have been using Beidou. While we for a bus,we can know when it is about to come.
Many smartphones have also been using Beidou. "Many people say,'Let me on GPS.,In fact, their phones are using Beidou,"jokes a salesperson in Beijing.
