Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any). The trade negotiations are finely balanced, with considerable progress made/ on the less contentious chapters, though quite a lot of ground/ remains to be covered on more tricky issues such/ as non-tariff barriers, rules of origin and market access.