S: Luke 1: 37
"For nothing is impossible with God."
O: Mary was a virgin when she gave birth to Jesus. The Holy Spirit will came upon Mary, and the power of the Most High overshadow her. So the holy one to be born will be called the Son of God.
R: even a virgin can give birth to a child. What more can God not do.
E: Trust in the Lord and believe in Him. For there is nothing God cant do.