In his "Address to Students at Moscow State University," President Reagan expresses the idea that a new era is being ushered in
by the power of human imagination. Which two universal ideas will most likely represent the message that resonates with the students of Moscow State University?
Have* this is because has* is past tense and have is more appropriate since there are multiple things you are referring too (Mercury, Venus, Earth and Mars). To be honest, these planets have a molten core.
