阅读短文，从方框中选出适当的词，并用其适当形式填空。有的需要加助动词或不定式符号。(每词限用一次)

Many people have heard of Barack Obama—the first African-American president. While Obama （1）_____________ in high school, he showed much talent in study. After graduating from university, he worked as a teacher. And he  (2) ______________ some books since 1995. These books help him earn millions of dollars. He gives away some of the money to charities. He (3) ____________ the President of the USA in the year 2008.

Most of the American people (4) _____________ confidence in Obama. They believe that a bright future (5) ____________ to them soon.

季节性降价属于不正当竞争行为。（）