Ex. 1 Fill in the blanks in the sentences with either "for" or "since". [1] I haven't seen my uncle ___ last Christmas. [2] We have been in the same class ________ 2 years. [3] We have lived here ________ March of 2010. [4] He has been my teacher ________ May. [5] They have studied web design _________ 3 months. [6] Facebook has been popular _________ 5 years. [7] I have had my iPhone _________ February 14'th. [8] My city has had a subway system ________ 3 decades. [9] Humans have travelled in space _________ 1964. [10] That song has been #1 on the charts ________ 3 weeks.

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