preoccupy
/pri:ˈɔkjupaɪ; pri`ɑkjəˌpaɪ/ v
(pt, pp -pied) [Tn]
engage (sb or his mind, thoughts, etc) so that he cannot think of other things; obsess 占据（某人）思想; 使（某人）心无二用; 迷住
Something seems to be preoccupying her at the moment. 她此刻若有所思.
Health worries preoccupied him for the whole holiday. 整个假期里他一直为健康状况而担忧.