Fill blank (iii).

Directions: Read the following passage having some numbered blanks.

The scientific revolutions of the 20^th century ______(i)______ to many technologies, which promise ______(ii)______ wholly new eras in many fields. As we stand today ______(iii)______ the beginning of a new century, we have to ensure fullest use of these developments for the well being of our people. Science and technology ______(iv)______ an integral part of Indian civilisation and culture over the past several millennia.