Zoos are a tradition, and a visit to a zoo is a wholesome, family activity. Modern zoos save (1) ... (DANGER) species by bringing them into a safe environment, where they are protected from poachers, habitat loss and starvation. They give their animal guests much more space. The animal areas no longer look like cages, but wide open parkland. It is a much more pleasant (2) ... (SOLVE) as the animals appear to be free while they are actually in a very protected environment which is (3) ... (COMPLETE) unpolluted and they have no shortage of good nourishing food. In fact the animals seem (4) ... (AWARE) of their captivity and relaxed while living in a controlled conservation area.