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What is the main idea of “young lions, young ladies”?

Emily is reading her friend's story. it uses transition words like and emily can tell that this story's organization is a) sequence of events b) cause and effect c) compare and contrast d) question and answer

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.