Here are the missing words for the text:

1. the
2. puts
3. about
4. is
5. he
6. or

### Explanation for the choices:

1. **the**: The context indicates that it's referring to one of the specific buildings in the city. "The highest buildings" suggests that there are several high buildings, so this word is necessary for specificity.

2. **puts**: The sentence implies that David dresses himself in his uniform. "Puts on his uniform" is the correct phrase used for getting dressed.

3. **about**: In the context of asking for information, "about anything that has happened" is the natural and correct preposition to indicate subject matter.

4. **is**: This word is used to indicate a state or condition. In this context, "Every day is different" is a complete thought that describes the variability of David's job.

5. **he**: This pronoun is necessary to refer back to David. The sentence requires a subject to precede the action of stopping traffic problems.

6. **or**: In this context, David could either “help people find car parks" or "show visitors the way.” The word "or" is needed to connect these two possible actions.

Let me know if you need any further explanations or assistance!