Cho (x/y+z)+(y/z+x)+(z/x+y)=1.Tính giá trị biểu thức M=(x^2/y+z)+(y^2/z+x)+(z^2/x+y)

74. The factory foreman is showing them……………..the factory.

75. “What is this button……………..?” – “It’s used to operate the machine.

76. “Whom was the helicopter invented………………..?- “Igor Sikorsky”

77. Don’t go away. Come and stand………………….me.

78. Cocoa butter is added, along……………………sugar, vanilla and milk.

79. Pour a little milk…………………my cup of coffee, please

80. Our group is planning to help the community……………encouraging all members to participate…………….a recycling program.

81. We hope to earn some money………………..our school Y & Y.

82. To be a member of our organization, you can register……………..today.

83. My father is good………………..gardening.

84 Tam had high marks……………..exams…………….working very hard……………….school.