Chan decides to make a positive change in his life. Instead of going to work with a frown on his face, he will force himself to smile when he walks into work. According to , by altering his behavior Chan is likely to change his negative attitude about work.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answereruption of molten material; magnetic stripes in the rock of the ocean floor; the age of the rocks themselves;

answerwake up early to start looking for work;