答案：1. When's Tony's birthday? It's on January 15th. What does he usually do on his birthday? He usually watches a film.
2. When's Amy's birthday? It's on September 22nd. What does she usually do on her birthday? She usually has a big dinner with family.
3. When's Jenny's birthday? It's on December 4th. What does she usually do on her birthday? She usually flies a kite.
4. When's Jack's birthday? It's on April 18th. What does he usually do on his birthday? He usually eats a birthday cake.
解析：根据图片连线，Tony连接f（看电影）和b（April 18 SUN），但原解析中Tony生日为January 15th，可能存在图片信息理解偏差，此处以常见匹配逻辑，假设人物与日期、活动正确连线后得出答案。