73. He is busy 　　　　　(准备)for the coming final examination.

72. The most 　　　　　(危险的)test happens when the new place is going through test flights in the air.

71. 　　　　　(土豆)grow well where the climate is cool.

70. Those scientists come from different cultures and have different b　　　　　 .

69. The criminal would suffer p　　　　　 , but he escaped being punished.

68. We do not call that a chemical change, but a p　　　　 　one.

67. Early in the morning we g　　　　　 　at the school gate and then set off together.

66. Smoking is f　　　　　 　in many public places.