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The following text is for questions 21 to 25.
 

    Tasya's mother was a nurse in a hospital. One night, Tasya had to go to the hospital too, because nobody was at home to take care of her. Tasya didn't mind. She liked to know about her mother's work.

    Tasya was reading her book in the hospital lounge when a patient approached her and asked why she was there. Tasya answered the question. The man asked about what Tasya wanted to be in the future. She said she wanted to be an English teacher. "Can you speak English?" asked the man. "Very little, but I wanted to practise more," explained Tasya.

    The next day, Tasya's mother came home with a surprise. She took Tasya to an English course. She said the man in the hospital had paid a one-year-tuition fee for Tasya. Tasya was sp grateful. She wanted to see the man to express her gratitude, but her mother said, "The man has recovered from his illness and he went back to his hometown in Bandung this morning. However, he wants you to enjoy the class and be successful teacher in the future." Tasya promised herself that she would study hard and gain success in learning English.

"Tasya was so grateful." (Paragraph 3)
The underlined word is closest in meaning to ____.