Practice to make presentation in English [on my job - 'for my job' or 'at work' better here]

Practice in 2012 showed that radio flight in the second half of the year provides a significant increase in interest to the our site; therefore, in addition to the permanent presence on internet, we recommend to strengthen strengthening the radio flight campaign. 

The [dynamics of the queries – not entirely sure what you mean; potentially better to say 'the results of the queries'] shows that the interest in the site is correlated correlates with [also possible to say 'correlates to'] the period of the campaign, so it makes sense to be active for the longest period of time.

[As of for prolonged channel – again, not quite entirely sure of meaning here] selected Internet the internet as one of the most effective channels for [or 'ways of'] the generation of generating visits to the site.