Frankly speaking, many teenagers have drunk alcohol, at least once, with their friends or their parents. Even if there is one who has never drunk, he or she would have time to drink at once when entering a college, even being still a teenager. People drink alcohol to open up to each other. First, colleges or universities are the place where students can think more freely, study more freely, and move more freely than before (there may be a little rule). The students there have to learn not only studies, but also the way to live as adults. Then  it should be important to learn how to drink alcohol. Many new students at a college are 18 years old. However, minimum drinking age is 20 years old. The gap of 2 years (18 to 20) is incomprehensible.