68. Mrs. Black went back to_______ place _____ she had found the diamond.

69. We had to _______hundreds of people because all of the seats were sold.

70. ______ successful launch of China’s first lunar orbit “Chang’e-1” has sent _____ waves of excitement across the country.

72. For many days I have been trying to ______ what it is that makes Jack so angry.

73. --- You just think of yourself! You kept me waiting for at least three hours.

--- I’m sorry that you _____ think so.

74. --- Sally, would you ______ the story?

--- But I told the second part of the story this morning! It should be Jean’s turn.

75. When on holidays, the railways put on _____ trains to make people’s travel more convenient.

76. All flights _______ called off because of the terrible weather, they had to go there by train.

77. --- Have all the important letters been delivered at the first time?

--- I’m sorry. _______ only 40% of them.

78. --- You _____ repay this debt this week according to the agreement.

--- Don’t worry. I _______ pay it off before the deadline.