88. Six men have been __________ in a mine for seventeen hours.

87. “At the time the murder was __________, I was traveling on the 8 o’clock train to London,” said the man.

86. On this __________, however, it had slowed down considerably.

85. They entered the country __________ (非法地).

84. Her tears __________ (流动) freely down her cheeks the moment she heard the sad news.

83. She is so __________ (固执的) that she never listens to other people’s advice.

82. I believe the house was __________ (故意地) set fire to, not accidentally.

81. He seems to have __________ (忽视，忽略) one important fact.

80. Cycling is highly b__________ to health and the environment.

79. It is time for us to take m__________ to stop air pollution in our city now.