Answer:
1- were
2- was
3- was
4- were
5- were
6- was
7- were
8- were
9- were
10- was
11- were
12- was
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Look everyone the answer is
B) To validate the history of the Kiowa people
4) Time-consuming lab work
3) Exhaustive note taking
It's asking you proof that Ramirez is a demanding teacher not about the course itself so it is not 1, 2, 4 or 6. It is 4 and 3 because it shows Ramirez was demanding by enforcing a heavy load of work