Answer:
I already helped with 1, and i don't know the answer to some of them, but here are some more:
Number 3 is actually a common riddle that exchanges 3 different animals/foods throughout cultures. Here's the wikipedia page for "wolf, goat, cabbage" with the solution to the riddle.
https://en.wikipedia.org/wiki/Wolf,_goat_and_cabbage_problem
here's the solution with the animals from your version put in. It works because the crocodile doesn't want to eat the peanuts.
1. Take the dove over
2. Return
3. Take the crocodile or peanuts over
4. Return with the dove
5. Take the peanuts or crocodile over
6. Return
7. Take dove over
and for number 6, the answer is the letter U.
The above should be personal vices, and the person who made their decision should be the one that has to deal with the choices they made. As long as they are following other laws that are in place, there is nothing wrong with alcohol use or gambling. As for drug use, the main drug that comes to mind is marijuana, in this case, if the drug helps in assisting MEDICAL NEEDS, or is provided to someone of age who understands the possible consequences, it should be legal.
A. Are is the answer because it makes the most sense