Answer:
Paolo buys a new set of tools to use in his plumbing business. I: Paolo is investing in his plumbing business by purchasing tools.
Kenji buys a sweater made in Guatemala. M: Kenji is purchasing an imported good which decreases the GDP.
Lucia gets a new video camera made in the United States. C: Lucia's purchase increases private consumption.
Kenji's employer assigns him to provide consulting services to an Australian firm that's opening a manufacturing facility in China. X: Kenji is exporting services to an Australian firm.
The state of Pennsylvania repaves highway PA 320, which goes through the center of Swarthmore. G: the state government spent money on repaving a highway.