Naruto Episode 21
Everyone present is startled by Gaara’s sudden appearance. As the siblings walk away, they explain that they came to Konohagakure from Sunagakure to take part in the Chunin Exam, a test to promote them to the next ninja rank. Kakashi reveals that he has nominated Team 7 for the exams. As Team 7 proceeds to the site of the Chunin Exam, they meet Rock Lee and his teammates. Lee asks Sakura to be his girlfriend, and she refuses as she walks away with her teammates.
Source: Wikipedia
Naruto Episode 21 – Identify Yourself: Powerful New Rivals
