1) I have lived here ___ 2010. a) for b) since 2) She has been studying ___ three hours. a) since b) for 3) They have been friends ___ childhood. a) for b) since 4) We have been waiting ___ a long time. a) for b) since 5) He has worked here ___ last year. a) since b) for 6) I have known her ___ ten years. a) since b) for 7) She has been awake ___ 6 AM. a) since b) for 8) They have been married ___ 20 years. a) since b) for 9) He has been sick ___ Monday. a) since b) for 10) We have been traveling ___ two weeks. a) for b) since

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