Open the brackets using the right form of the verb.How long has man been on earth? Let us travel 5,000 years into the

How long has man been on earth? Let us travel 5,000 years into the past. We are in the days of before man learnt to write. Recorded history has not begun yet. Let us go further into the past to 8,000 years ago. We are in a world without cities or towns, houses or roads. Yet there are people, about five million of them, living on all five continents. The have cows and horses and they farm the land. To find the first man we must go many hundreds of thousands of years info the past. The earliest true human being/Homo sapiens, appeared in Europe more than 50,000 years ago.