how the Brunei government handle their economy in year 1997?

Answer 1

They handled their economy in 1997 as business as usual, until the Asian financial crise hit in 1997 and 1998.
At which time the value of their GDP dropped dramatically as the demand for Brunei's natural resources dropped below the levels of 1980. Because of this, they dropped many of the barriers they had to foreign trade in 1997 and 1998.