Identify and correct errors involving subject-verb agreement

The experimental site, islands off Noumea in New Caledonia, (is remote from any human activity/are remote from any human activity/remote from any human activity/both are remote from any human activity).

Contrary to the results of the experiment (fresh water prove to be intensively concentrated/fresh water proves to be intensively concentrated/fresh waters are intensively concentrated/prove fresh water is to be intensively concentrated) in the middle of the island rather than on its edges(that is the usual zones/which are the usual zones/it are the usual zones/there are the usual zones) of sea water-freshwater interaction.

Complementary (analyses/analysis) derived from dialect study findings (have revealed/is revealed/are revealed)the importance of on-site research.

The density of the vowel changes and the greater degree of consonant development

(is maximal in London suburbs area/are maximal in London suburbs area/it is maximal in London suburbs area/they are maximal in London suburbs area).

On the area margins(the phenomenon is observed/are observed the phenomenon/there are the phenomenon/it is the phenomenon), with mixture of phonetic variables.

A number of special conditions (is/are) necessary for the phonetic change sources to form.

There (is/are) two types of urban dialects in England.

Two years (is/are) a long time when you have to wait.

The number of trees in the National Park is not great.

Each of the students (is/are) to submit their papers.

No news (is/are) good news.

The President along with his advisers (is/are) expected to arrive in an hour.