Explanation:

- The passage describes Albert's interaction with native people, indicating that he has learned their language and engages in conversation with them.

- Blank (2): After learning the language, Albert could talk to the native people about their problems.

- Option 1: "them" is the correct choice as it refers to the native people Albert interacts with. "them" is the correct answer.

- Option 2: "you" is incorrect as it suggests direct address, which doesn't fit the context of the passage.

- Option 3: "himself" is unrelated and doesn't fit into the narrative of addressing multiple people.

- Option 4: "us" would imply inclusion of the speaker and listener, which is not indicated in the passage.