Last year, expensive apartment buildings (A) were built in this big town and make (B) the cost of (C) living (D) increase. Sửa: "make" -> "made" ( hòa hợp với were)

Community (A) activities (B) have organnized for the past five months in order to help the locals (C) feel less (D) stressed. Sửa: "organnized" -> "have been organized" ( bị động )

Free education for the poor (A) has been carried out (B) for ten years in order (C) to poor children (D) can go to school. Sửa: "(C) to poor children" -> "(C) for poor children"