1. I can reply to your invitation and thank you for having nine meals with my sister in three days. I am very excited about this opportunity. I'm looking forward to trying all kinds of different foods. Thank you for your invitation. I am very happy to taste all kinds of food with my sister.

2. Eating nine meals with my sister for three days can reply and express my gains. Thanks to the opportunity given by my sister, it not only satisfies my appetite, but also is a valuable time to share food and enhance my feelings with my sister. In this process, I can also learn some knowledge and skills about food.