Can anyone give me examples on what he means by his question?can I put “keep working hard” in there

Which punctuation mark would best fill in the blanks in the following sentence in the past year i visited denver, colorado portland oregon and seattle washington

Hatchell landscape architecture firm worked on which two of the following projects

Match the term to the purpose it has. 1. but 2. furthermore 3. meanwhile 4. in the distance 5. first 6. therefore 7. in other words 8. for instance a. show space relation b. introduce an illustration c. repetition of an idea d. take away, limit, or oppose e. show a consequence f. indicate order g. show time relation h. add ideas