学进去

A piece of stone1．(find) on a Dutch beach suggests that our extinct human relatives, known as Neanderthals, were cleverer than previously thought. The Neanderthals2．（live）alongside human ancestors in Europe for tens of thousands of years, before dying out about 40, 000 years ago. They were much stronger than modern humans, but it's long been assumed that human ancestors were3．（smart）than the Neanderthals. However, the stone tool made by Neanderthals suggests otherwise.