Water doesn't currently exist on Mars' surface, but it used to. About 4 billion years ago, something happened to Mars' atmosphere, and most of the liquid water     1    （disappear） due to harmful radiation. But some of     2     may still be underground. Could those ancient water holes contain life?

China's Tianwen-1 mission will search     3    the existing water by radar fixed on the rover （月球车）.The European Space Agency's spacecraft found evidence for subsurface water,     4    （use） radar from space, but this will be the first time a rover has searched from the ground.

Tianwen-1 will also give China     5    （value） Mars experience and lay foundation for a sample return mission planned for     6    end of the 2020s. Getting Martian samples back to Earth is a top priority for the scientific community. Despite the impressive advances     7    （make） in placing science instruments on spacecraft, only the technology on Earth,     8    can test samples accurately, is to verify the presence or absence of life in a sample.

As of 2020, only NASA has landed and operated spacecraft on Mars     9    （successful）. More countries exploring Mars means more     10    （opportunity） for global cooperation. Space exploration brings out the best in us all. When more nations work together, everyone wins.

How do you know I am really a human writing this article and not a robot?

Forbes uses     1     AI robot called Bertie to assist in providing reporters     2     first drafts for news stories. The Washington Post also     3    (have) a robot reporting program, Heliograf. In its first year, approximately 850 articles     4    (publish) and it even earned an award for its ^“Excellence in Use of Bots”. However, The Post is using their system to not replace journalists, but to assist them and make their jobs     5    (easy) and faster.

Journalists are worried that robot content could weaken reliable media outlets that they write for by not     6    (produce) quality content. However, some say that will not be the case but rather increase the quality by giving reporters the ability     7    (concentrate) on quality over quantity. All in all, this could     8    (true) benefit journalism.

“The work is creative, it’s about     9    (curious), it’s about storytelling, it’s about digging and holding governments accountable, it’s critical thinking, it’s judgment—and that is     10     we want our journalists spending their energy,” said Lisa, the director of news partnerships for The A. P.

Ever since Neil Armstrong first set foot on the Moon back on 21st July, 1969,     1     was one small step for man, but one giant leap for mankind, people have become accustomed     2     the idea of space travel. Millions of people watched that first moon landing on television, aware of     3     difficult and dangerous an adventure it was. It was a success and all three astronauts made it safely back to Earth.

Fifty years ago, China successfully launched its first satellite, Dongfanghong 1, and started     1     new chapter in space exploration.    2    ( mark ) its 50th anniversary, the China National Space Administration announced the name for the country’s Mars planetary exploration program on April 24.

The mission, Tianwen got its name from a long poem Tianwen    3    ( write ) by Qu Yuan, a famous poet of the Warring States Period. In the poem, Qu raised a series of questions     4    ( concern ) the sky, stars, natural phenomena, myths and the real world, reflecting his doubts on traditional ideas     5     his pursuit of truth.

So far, China     6    (make ) remarkable progress in space exploration. In 1970, China launched its first man-made Earth satellite, becoming the fifth country in the world to launch man-made satellites     7    ( independent ) . Over the past few years, Chinas missions, including the Shenzhou and Change series were designed to explore outer space, expanded     8     ( mankind ) understanding of Earth and the universe.

This time, the Tianwen series will carry out the first Mars exploration mission,     9     represents a milestone for Chinas move toward deep space.

With the names deep roots in Chinese traditional culture, Tianwen demonstrates the     10    (determine) and perseverance of Chinese people to move further into deep space.