Indentify the underlined part that must be corrected.(Tìm lỗi sai ở 1 trong những phần gạch chân và sửa lại cho đúng):
LƯU Ý: NHÌN KỸ ĐỀ RỒI MỚI TRẢ LỜI! TUYỆT ĐỐI KHÔNG COPY MẠNG VÌ CÂU HỎI CỦA MÌNH CÓ THỂ HƠI KHÁC!
52. Louisa May Alcott, she best known for her books for children, served as a nurse during the Civil War.
53. Who is the last person left the office yesterday afternoon?
54. The experiment was conducted by Dr. Adams last week was unsuccessful.
55. The world's rain forests are being cut down at the rate on 3,000 acres per hour.
56. The nature environment includes all natural resources that are necessary for life.