Answer and Explanation:
Conjecture : to form an opinion without strong evidence. There's been a lot of conjecture in the media recently about the marriage
Interpose : to come between two things, to interrupt. Local activists interposed between party leaders and the people.
Celestial : relating to the sky. The moon is a celestial body.
Sagacity : the capacity to reason, judge, and act intelligently. He was unconscious of his sagacity.