Fill in each gap with a suitable word based on the information of the text.

Bhutan has long been admired for its commitment to (a) ______ , which has kept its air and forests almost untouched. The government has taken strict measures to preserve its rich (b) _______, making the country home to endangered species like the red panda. Tourism was introduced in 1974, but it remains highly (c) _______ to reduce the risk of foreign influence. Even modern technology such as television and the Internet was initially seen as a possible (d) ______ to Bhutan's traditions, so it was permited only in 1999. Unlike most other nations, Bhutan defines progress not by economic growth but by national happiness, a philosophy that (e) ______ people's well-being than economic growth.