Question

1. astronauts on the international space station must work with each other. the work requires them to conspire/cooperate.

Explanation:

To determine the correct word, we analyze the meanings: "conspire" means to plot secretly (often for bad purposes), while "cooperate" means to work together towards a common goal. Astronauts on the ISS working together is a positive, collaborative effort, so "cooperate" is appropriate.

Answer:

cooperate