1) We haven't heard from them____ three days. a) for b) since 2) Helen hasn't sent us an e-mail____ a month. a) for b) since 3) She has had fever ____ Monday. a) for b) since 4) He has owned this car ____2010. a) for b) since 5) They have known each other ____ a long time. a) for b) since 6) Adam has taught in the school ____ March. a) for b) since 7) Emma has not spoken to her friend ____ a week. a) for b) since 8) Maria and Dominic have been friends ____ they were children. a) for b) since 9) It has not moved ____ thirty minutes. a) for b) since 10) Mr. Smith has taught science ____ he was 25 years old. a) for b) since

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