In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

The Great Indian, or Thar, Desert forms an important southern extension of the Indo-Gangetic Plain. (1)______ is mostly in north-western India but (2)______ extends into eastern Pakistan and is (3)______ an area of gently undulating terrain . Further, (4)______ it are several areas dominated (5)______ shifting sand dunes and numerous isolated hills.