#How did the angel say this would happen since Mary was a virgin?

The angel said that the Holy Spirit would come upon Mary and the power of the Most High would overshadow her. [1:35]

#The angel said that this holy child would be whose son?

The angel said that the child would be called the Son of God. [1:35]

#What did the angel say is impossible for God?

Nothing. [1:35]