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Bài 4: Điền vào chỗ trống "who" hoặc "which" 1. A soldier is someone **who** works in the army 2. A student is a person **who** goes to school 3. An ostrich is a bird **that** cannot fly (câu này thường dùng "that" thay cho "which") 4. A cook is someone **who** makes meals at a restaurant 5. A tire is a thing **that** you can find on a wheel (câu này thường dùng "that" thay cho "which") 6. A stick is a piece of wood **that** is long and thin