Select the most appropriate word from the options against each number:

On June 15, 2020, Indian and Chinese troops _(1)__________ in a brawl that left twenty Indian soldiers dead while causing an unspecified number of Chinese casualties. The clash is a part of a broader border standoff _____(2)______the Galwan River between the two forces on the Line of Actual Control that is yet to be resolved. The Indian strategic community is broadly in agreement that this border dispute marks an __(3)________ decline in India-China ties. They argue ___(4)_______the very basis of relations that emerged _____(5)______former Indian prime minister Rajiv Gandhi’s visit to Beijing in 1988 has been shaken,if not destroyed.