The poem describes Yuri Gagarin's first human trip into outer space (April 12, 1961) - and suggests that this flight was some kind of a triumph for humankind (Vostok's capsule clambers / Up the tall victory column).
The answer in the blank is common themes. It is because using common themes or including them on the speaker's speech could make the audience relate on the topic and to be intrigued or to be interested. With this method, not only will the speaker give out his information but he or she could capture the attention of the audience.
Guidance? Advice? Approval? Permission? is this multiple choice?
