表达歉意与原谅的交际用语 — 英语阅读题

Read the short passage and answer the question. At lunchtime, Ben ran to get some water and bumped into Mary's desk. Mary's milk spilled on her book. Ben felt bad. He said, "I'm so sorry, Mary. I didn't see your milk. Let me clean the desk for you." Mary was a little sad, but she looked at Ben and said, "That's all right. It was an accident. Please be careful next time." Then the two friends cleaned the desk together and smiled at each other. Question: What did Mary say to forgive Ben? (Mary 说了什么来原谅 Ben？请用文中的原句回答。)