Present perfect exercises with answers - Tenses exercises

Use the present perfect form of the verbs to complete the sentences.
Grammar review present perfect
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We have worked fine since I got back. (work)
The success of his commitment has been evident ever since the drive for peace in the region began. (be)
The Washoe antelope herds have fed the Paiute since the long-ago dream time. (feed)
I have worn glasses since I was 12, but nobody ever asked to borrow mine. (wear)
It has been twenty years since I first mentioned the Dorje Shugden public restriction. (be)
Legal deposit in Canada has been in effect since the National Library of Canada was created in 1953. (be)
A relative newcomer in Finland, where it has become more common since the 1930s. (become)
I have been off chemo since 18th of April 2011. (be)
Creative Commons licenses have been around since 2001. (be)
Frode Syversen joined Mepex in 1991 and he has been CEO since 2005. (be)
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