However, if your assignment was to write a functional survey, you will need to edit some of your questions. They are riddled with confirmation bias.
Before I answer, this needs to be echoed. Your data is likely going to be skewed based on your wording. Has the instructor reviewed these questions? I ask merely because I hope you won't get burned for "stacking the deck" toward a certain bias.
Also, I teach 16 to 20 year-old students in high school, so my profession is likely to make me bias as well.
1. Do you believe it is fair that the drinking age is set to 21, when adulthood is achieved at 18? At 18 you can vote, serve on juries, get married, sign contracts, join the military, be prosecuted as an adult, and buy tobacco, so why not alcohol?
I'll say no, but I don't think "fairness" is an important matter here. If one makes any of those decisions listed and available at 18, one should be entirely sober given that humans' brains in the areas related to decision making are not fully developed until the early to mid-twenties.
2. Many teens (underage drinkers) get in trouble because they end up binge drinking, do you think that lowering the age and education them and teaching them to drink responsible could work?
No. Education would help, but not lowering the drinking age.
3. Do you think that lowering the drinking age will increase the number of traffic fatalities?
4. Do you think that lowering the drinking age could remove it as a taboo to those between 18 and 21, thus lowering the thrill to break a law?
No. Getting intoxicated is thrilling enough.
5. Do you agree that by prohibiting teens from drinking in bars, restaurants and other public places forces them to drink in unsupervised places where they are prone to get hurt or drink too much?
No. Adults over 21 drink in public and still hurt themselves and over-drink often.
6. Do you agree that keeping a higher drinking age sends a message that consuming alcohol is a sign of maturity, thus teens want to consume it to seem mature?
No. From my experience as a former teen and a high school teacher, getting drunk is nothing about seeming mature and mostly about getting stupid "shitfaced" drunk.
7. Do you believe that no matter what age the drinking age shifts to, there is no way we can prevent traffic casualties? (As in, moving the drinking age up from 18 to 21 just shifted the risk from teens to young adults, therefore it does not matter what the age is as anyone can suffer from alcohol related accidents)
8. Keeping the drinking age at 21 can be expensive, yet also ineffective. Would you agree that it would be better to shift attention away from the age of 21, lower it to 18, and then spend the time and money on educating the youth about alcohol?
No. The same time and money would be spent prosecuting minors.
9. Do you think that drinking in moderation, without over doing it, can be good for one’s health?
10. Do you think that setting the age to 21 is discriminating, therefore unconstitutional, to those from 18 to 20 since they cannot drink?
Likely, if one presses the matter legally. There are many things and acts that are currently illegal which those who choose to indulge in them would cry "discrimination".