题目内容：

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 orbit (轨道) 2.(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 the aim of providing navigation services4.countries and regions which participate in the Belt and Road Proposal by the end of 2018. “This is a key and5.(value) step for BDS developing from a Chinese experimental system to a regional and then a global navigation system,” said Yang Changfeng, chief expert6.contributed much to the BeiDou system. The positioning7.(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 Big Dipper, the BeiDou system has been serving China for 18 years where another six BDS-3 satellites will be put into the Medium Earth orbit from 2019 to 2020. The system is expected9.(provide) first-class services around10.globe by the end of 2020.