1. They are going on a trip at the end of the first term. (dòng 2, 3)
2. Because many of them have never been inside a cave. (dòng 6)
3. It is only over 20 kilometers from their school. (dòng 8, 9)
4. They are bringing their own food and sharing buses with some other classes. (dòng 15, 16)
5. She is anxious about getting her parents' permission, because they may not want to let her stay the night away from home. (dòng 4, 5, 6 từ dưới lên)
