câu 1 : a baker , b firefighter , c engineer , d naturelist
câu 2 : a endangered , b extinct , c dead , d disappeared
câu 3 : a ocean , b desert , c habitat , d population
câu 4 : a identifies , b poaches , c inspires , d hunts
câu 5 : a woolly mammoth , b dodo , c quagga , d sea wolf