SOME PEOPLE THINK THAT IT WOULD BE HARD WORK TO CONSERVE ... RESOU...

41. - 70 DE THI CHUNG CHI B TIENG ANH
70 DE THI CHUNG CHI B TIENG ANH

41. Some people think that it would be hard work to conserve ... resources.

a. nature

b. naturalize

c. natural

d. naturally

 c