concern oneself ______ 关心……
Anger did not help people __________ (表现)any better in mental tasks.
Unfortunately your ticket does not __________ (保证）you a seat.
Children who are taller have an obvious __________ (优势）when playing football.
We expect to see a dramatic __________ (增加）in the number of visitors in October.
Fascinated by the night sky, he __________ (购买）his telescope in the 1880s.