Despite the fact that Jack has lived in USA for many years he finds it no easy to himself

问题补充：

Despite the fact that Jack has lived in USA for many years，he finds it no easy to himself to its culture and customs.

A. adopt

B. adapt

C. apply

D. concentrate

答案：

A. adopt

(答案→)B. adapt

C. apply

D. concentrate

解析： adapt oneself to sth使自己适应或习惯于某事，符合题意。