Tom was a college  student. He often made excuses not to attend classes. Also he spent much of his free time playing computer games. He never went to the library to study. How time flew! At the end of the term, there was an important thing--the final exam . He was afraid of it. "What should I do?" Tom walked up and down in the room the day before the exam. He was so nervous. Suddenly, he thought of an idea. The next morning, Tom went into the exam room very early. He found a young man and took a seat next to him. "Hey you!" Tom greeted. "What?" The young man asked. "Can you help me?" Tom said politely. "Please let me copy your paper during the exam." When hearing his words, the young man just smiled but said nothing. When the bell rang, the young man stood up and came to the front, saying "It is the time for the final exam. Now I will hand out the papers to all of you and collect them in one hour." Tom sat there with his mouth wide open. Tom walked up and down in the room the day before the exam because  _  .
he liked studying in the library he wanted to take exercise he was worried about the coming exam he was waiting for somebody