82. _________(贯穿) history, people from many different countries and cultures have lived together in Britain.

81. In order to travel fast , many families own a car, but as a matter of fact, we can move more _________(方便) by bike than a car in busy cities.

80. I remember you mentioned the same thing on a p___________ occasion.

79. He was o　　　　 　with an English story so that he didn’t hear someone come in.

78. It’s terrifying to find that the earthquake happened in Japan d_______ the whole city.

77. These days in China many people are c_______ about the safety of food.

76. With the midterm examination a_________, the students are working harder and harder.