2 . 语法填空
The most challenging work takes place 1 we need to perform tasks outside the space station, such as 2 (test) new equipment, monitoring scientific experiments or repairing the space station. In the 3 (circumstance), it’s time for a spacewalk. First, we put on our spacesuits, 4 allow us to breathe in space and protect us from 5 (expose) to the cold and radiation. Then we head out, and sometimes perform tasks for hours at 6 time, with the beautiful Earth visible below. Splendid 7 the view of the Earth is, spacewalking is not as exciting as you might think. It’s 8 (probable) the most dangerous work, with potential risks such as electric 9 (shock). That’s why every spacewalk is carefully 10 (plan).