问题补充：
Jack, please do not yourself in that matter, or you will be in great trouble.
A. promote
B. improve
C. compete
D. involve
答案：
A. promote
B. improve
C. compete
(答案→)D. involve
解析：句意，Jack，不要参与那件事情，否则你会有大麻烦。promote 推进 improve 提高 compete 竞赛 involve 包含，参与，根据题意，故选 D。
