Answer:
concrete:concrete
Explanation:
Both the car and the police office are physical things that can be touched and seen, making them concrete nouns. Abstract nouns cannot be detected by our 5 senses, but it is not the case for the words in this question.
have concluded
a compound subject requires a plural verb
"Those who Sacrifice for others are great people"
The story narrates how two people sell what they like in order to buy the other one something they would love.
Hope this helps
Ethics
Many dark animals were around, and a creature (harry suspects it is voldemort) was drinking unicorn blood, which is a terrible crime.