1. The Millennium Dome, or the O2 as (A) it (B) is (C) called (D) now that the mobile company of that name owns the naming rights, has become a distinctive part of the London skyline. (correc

1. The Millennium Dome, or the O2 as (A) it (B) is (C) called (D) now that the mobile company of that name owns the naming rights, has become a distinctive part of the London skyline. (correctly)