题目内容：

阅读下面短文, 在空白处填人1个适当的单词或括号内单词的正确形式

US astronauts Christina Koch and Jessica Meir stepped outside the International Space Station Friday morning. It was the first time in history that two women 1.(do)a spacewalk together. Koch and Meir were expected 2.(spend) more than five hours outside the space station to replace a failed power controller,but extended their spacewalk to accomplish some get-ahead tasks on the space station.

The astronauts spoke with the President and Vice President during the spacewalk.The conversation marked the first time that a sitting （现任的） President spoke 3.(direct) to astronauts who were physically outside of a spacecraft in space. The President also expressed his congratulations to the two astronauts, 4.(say) that they were very brave people for their service on the Space station.

Meir told the President that she as well 5. her fellow saw the spacewalk as their job. It was something for which they had been training for six years. They met with many 6.(difficulty) but they succeeded in 7.end.

They recognized that it was a 8.(mean) achievement. Meir said that there had been a long line of female scientists, explorers, engineers and astronauts and they had followed in their footsteps to get them 9. they were. Meir and Koch hoped what they did could give 10.(encourage) to everybody, not only women.