1 He did his homework , then he went to bed
-> before
2 he did the test . First he read the question very carefully
-> after
3 they couldn't go to class on time because it was raining heavily 
-> because of
4 in spite of his poverty , he tried to study hard
-> in spite of
5 they visited Dalat many times because of enjoying fresh air and friendly people here
-> because
6 i was working with a woman . She used to be a lawyer
-> the woman