2013.65.The company (employ)_______ more than 50 IT engineers since last year.
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2012.122.The tour guide marked some places of interest on the map for us (visit)_________ .
2010.125. We have received your letter of May 10th, (inform) _______ us of the rise of the price.
2011.124.My (person)______ experience suggests that we should contact the customers first.
2010.122. Have you ever noticed any (improve)________________ in the work environment of our factory?