In order to pinpoint which topics might be covered on a test, a student should review
a. class discussions
b. previous assignments
c. textbooks
d. all of the above

If you want to best predict the topics that might appear on a test, it is best that you use all the available sources, that is, that you use class discussions (inlcuding questions to the teacher), textbook and if you have access to, all previous assignments of the teacher.

So the best answer is: d. all of the above.

It takes about 3-4 days to take a wounded soldier back to the united states depending on the state of the soldier which depends on how fast they can take it and the type of plane that they're flying with the conditions they are flying are also factors. Depending on the route, avoiding war zones when they fly home won't always be a straight path back home. It takes longer because of some injuries, such as back injuries, you can only have so much movement from the plane, and too much movement could cause harm to the injured, such as being paralyzed.