77. In my o__________,the price of oil will keep going up.

76. He drew the _____________(轮廓)of a house on the paper.

75. English is the o__________language in India.

74. The machine is o____________by electricity.

73. He often o__________me a lot of help.

72. The policemen are trying to find the o_________of the bikes.

71. The Red Cross is an international o_________which cares for people who are in need of help.

70. O________ he arrives, we’ll start.

69. The accident o________ at five o’clock..

68. The o___________of ‘new’ is ‘old’.