When traveling to Russia alone, he found two very strange people while shopping: one digging a pit in front, and the other one filling the excavated soil with a shovel in the back. This person felt strange, so they asked What are they doing? They replied that they were planting trees. This person felt even stranger. The two men explained that the person responsible for planting the sapling was sick and did not come. What does this passage tell us? ["Don't pay attention to others' opinions at work.", 'Should be responsible at work.', 'Ways and means at work.', 'Work without results equals failure to do.']