4．
71．Working very hard，he is making progresslittle by little．
72．We met ten years ago andever since we have been good friends．
73．I know you don't like her，but you couldmake an effort to be polite．
74．Mary knocked the candle over and the table clothcaught fire．
75．Spending too much time on electronic productshas a bad effect on both adults and children．
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| make an effort take in catch fire ever since，have a bad effect on，little by little end up |
72．We met ten years ago andever since we have been good friends．
73．I know you don't like her，but you couldmake an effort to be polite．
74．Mary knocked the candle over and the table clothcaught fire．
75．Spending too much time on electronic productshas a bad effect on both adults and children．