阅读下面的材料，在空白处填入适当的内容或括号内单词的正确形式（每空不多于三个单词）

    Brian was not good at public speaking. One day, he ____(invite) to makea speech at a church. His younger sister, Ann knew he was nervous and tried to calm him down. "Don't worry. Everything____(be) fine. “When the day came, Brian's car had ____accident on the way to the church. Luckily, he was not____(bad) hurt and arrived at the church on time. It was his turn. Whenhe stood up, hit coat became tangled with his chair. After a few minutes, he finally began his speech. but he was so nervous ____he dropped his book. Many people thought he would run,____ he went on.

    Suddenly, people saw something unusual____(run) down from his nose, blood! He stopped speaking when he saw the blood. But he still tried to finish his still tired to finish his speech. Then Ann quietly moved to the front and handed him her handkerchief. Then she gave him a smile and ____(return) to her seat.

    It was a really simple gesture, and might be the ____(simple). She just saw someone in need, and gave him a hand. In the end, Brian finished his talk, ____ more confidence.

据材料一，概括作者的核心观点。据材料一、二，指出玛雅文化艺术的重要形式。