Chọn đáp án C.
- concemed/kan'sɜ:nd/ (v-past/ adj): quan tâm, liên quan
E.g: Her attitude concerned me.
- raised /reizd/ (v-past): nuôi, tăng
E.g: The government raised taxes.
- developed /di'vel.əpt/ (v-past): phát triển
They developed a new policy to deal with the problem.
- returned /ri’tɜ:nd/ (v-past): trở lại, trở về
E.g: They returned home after many years of travelling.