71. What is the higher mountain in the world?

highest    

72. Why don't you borrowing books from the local lending library? 

borrow

73. No one have solved such a difficult problem.        

has

74. Thank you very much of the present that you sent me. 

for

75. I didn’t went to school yesterday because of the storm. 🡪

go

76. My father doesn’t like speak  English.    

speaking    🡪

77. The course is good, but more hard than I thought. 🡪 

harder

78. Ha Dong is the town where I am born and grew up. 🡪 

was

79. Sleeping all day, to eat too much and never going out is unhealthy.

eating

80. The lesson that we are learning now is very interested but difficult.

interesting

Tổng 3 kho là: (349 + 317 + 338) : 2 = 502 (tấn)

Kho I có: 502 - 317 = 185 (tấn)

Kho II có: 502 - 338 = 164 (tấn)

Kho III có: 502 - 349 = 153 (tấn)

        đ/s

đúng