83. marie curie was born in poland in 1876
84.her father died early and his father tried hard to bring up the four children
85. She learnt to read and write at the age of 4
86.at school she was very good at natural sciences
87.when she was 16, she left school and went to france to study

76 It is difficult to find a good hotel in the countyside 

77 you don't have to finish the work today because it isn't necessary 

78 the stomachache prevented mr John enjoying the meal

80 I would rather you didn't make too much noise. ...

81 because of the heavy rain , we have ....