The word 'enroll' mentioned in the passage means ______ .
What does the phrase "expertise in skydiving" refer to?
Which of the following has the closest meaning of "employ"?
"Vostok-6 was the final Vostok flight and was launched two days after Vostok-5"- what does the statement imply?
Vostok-6 launched faultlessly. Here the word "faultlessly" stands for-
Who was Tereshkova's back up cosmonaut?