Use of English PRO

The 3.3-million-year remains of a human-like child were (0) ORIGINALLY found in a block of sandstone in 2000 but it took over five years of (1) ............ (CARE) work to free the bones. Judging from the (2) ............ (LONG) of her teeth, the infant was probably about three years old when she died. According to (3) ............ (RESEARCH) working in this area, these remains were (4) ............ (USUAL) because of their completeness and this gave them a great opportunity to study the (5) ............ (DEVELOP) of one of our distant ancestors. Earlier discoveries, such as the 3.2 million-year-fossil of an adult female known as ‘Lucy’, were still regarded as highly significant but their remains were less preserved. Since the species has a (6) ............ (MIX) of ape-like and human-like qualities, scientists said that the findings told us a lot about our early ancestors. However, their conclusions came in for (7) ............ (CRITICISE) from some people. They said there was (8) ............ (SUFFICIENT) evidence to regard the remains as the missing link between apes and humans.