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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

Two new satellites of BeiDou Navigation(导航) Satellite System (BDS) 1. (send) into space on a Long March-3D carrier rocket from the Xichang Satellite Launch Center in Sichuan Province, China at 2:07 a.m. on November 19,2018. The satellites entered a Medium Earth orbit2. (safe) more than three hours later and will work with 17 other BDS-3 satellites already in space. They are also the 42nd and 43rd3. (member) of the BDS satellite family.

China launched these satellites with 4. aim of providing navigation services for countries and regions which participate in the Belt and Road Proposal by the end of 2018. “This is a key step for BDS developing 5. a Chinese experimental system to a regional and then a 6. (globe) navigation system,” said Yang Changfeng, chief designer of the BeiDou system. The positioning 7. (accurate) of the BDS-3 system has been improved to 2.5 meters to 5 meters, said Yang.

8. (name) after the Chinese term for the Plough, the BeiDou system has been serving China for 18 years 9. another six BDS-3 satellites will be put into the Medium Earth orbit from 2019 to 2020. The system is expected 10. (provide) first-class services around the globe by the end of 2020.

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