Answer: Since a long time they have tracked down no gold in that country
Explanation:
“have” should be replaced with “has”.
Answer:
<h3>If something changes or is done gradually, it changes or is done in small stages over a long period of time, rather than suddenly. Electricity lines to 30,000 homes were gradually being restored yesterday. Synonyms: steadily, slowly, moderately, progressively More Synonyms of gradually.</h3>
<h2>Hope it helps you.</h2>
<span>“I am not an advocate for frequent changes in laws and Constitutions. But laws and institutions must go hand in hand with the progress of the human mind. As that becomes more developed, more enlightened, as new discoveries are made, new truths discovered and manners and opinions change, with the change of circumstances, institutions must advance also to keep pace with the times. We might as well require a man to wear still the coat which fitted him when a boy as civilized society to remain ever under the regimen of their barbarous ancestors.” -Thomas Jefferson</span>
