How should the underlined sentences be revised to
maintain an objective tone?
O Research was done, and we can't believe that the
pipes are so old and contain lead.
O Research has revealed that several pipes were
installed in 1910 and may be leaching lead.
O Research suggests that every single one of the
pipes in the area was installed in 1910.
O Research has revealed that many pipes are one
hundred years old and will be difficult to replace.