79. The __________(大多数)of students think that they should be given more time to do sports after class.

78. The two bags d_________ in color --- one is red, the other black.

77. Everyone knows that many people today are still facing ________ ( 饥饿)

76. G__________ speaking, a real friendship means not taking but giving.

75. A few _____________(反对意见) have to be dealt with before we can start the project.

74. Obama was e_________ the first African-American president in the United States.

73. The machine won’t work p________ if you don’t oil it well.

72. There were many job ___________(申请者)for the position, but in the end only two were hired.

71. As long as your suggestion is r____________, we’ll take it.

22．(10分)设是奇函数，(a,b,c∈Z),且f(1)=2,f(2)<3,求a,b,c的值。