问题补充：
Jack tries his best to learn how to make a vase, in order to their promise to finish an artwork with her.
A. bury
B. solve
C. perform
D. organize
答案：
A. bury
B. solve
(答案→)C. perform
D. organize
解析：A. bury埋葬，B. solve解决，C. perform表现，表演，D. organize组织，句意：杰克尽最大努力学习怎么做花瓶，为了履行他们要一起做个艺术作品的诺言。perform one’s promise履行诺言，所以选C。
