make an effort take in catch fire ever since，have a bad effect on，little by little end up
71. Working very hard, he is making progress _______________.
72. We met ten years ago and ______________ we have been good friends.
73. I know you don’t like her, but you could ________________ to be polite.
74. Mary knocked the candle over and the table cloth _______________.
75. Spending too much time on electronic products ________________ both adults and children．