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2 She was late for work because she had missed a bus                                                                           3 They overslept because they had not set alarm                                                                                         4 He felt sad because his friends had forgotten his birtday                                                                   5 I could not open the door because i had lost  my keys                                                                                   6 She failed an axam because she had not studied enough                                                                         7 They could not afford to go out because they had spent all money