1 in spite of his poverty , he tried to study hard
-> though
2 although it was snowy , all the students went to class on time 
-> in spite of
3 they visited Dalat many times because of enjoying fresh air and friendly people here
-> because
4 i was working with a woman . She used to be a lawyer
-> the woman
5 Lisa let the windows open when she was out.this was very careless of her (use which)
->