This nation has given australia its greatest economic boost through the sale of natural gas.
united states
china
japan
new zealand

China

Explanation:

Based on the 2018 Chinese efforts to use cleaner energies, they started to buy liquified natural gas (LNG) from different countries, because of the tensions between them and the american government, they were nulified as suppliers, so the main competitors remained Russia and Australia, Australia became the main supplier and to this day China remains the second largest importer of LNG, and the demand will continue to increase.

the cost of college has risen faster than inflation for many years.

the high price of student services and administration are two reasons for the rapid increase in cost.