Remember, the full list of Reference Questions can always be found in the sidebar or at this link.
Question: According to Heb 10:4, What is impossible?
Answer: For the blood of bulls and goats to take away sins. (cf Heb 6:4, 6:18, 11:6)
Question: According to Heb 10:10, What was once for all?
Answer: (By that will) We have been made holy through the sacrifice of the body of Jesus Christ once for all. (cf Heb 7:27, 9:12, 9:26; 1Pe 3:18)
Question: According to Heb 10:12, He sat down where?
Answer: At the right hand of God. (cf Heb 1:3, 8:1, 12:2)
Question: According to Heb 10:16, I will put my laws where?
Answer: In their hearts (and I will write them on their minds). (cf Heb 8:10)