Dialogue Analysis:
a) Topic of the dialogue: The dialogue is about Bob and David deciding where to eat out. David suggests Marcel's, then Castella, and finally Antonio's.
b) Decision and Explanation:
- Where they decide to go: They finally decide to go to Antonio's.
- When: The dialogue implies they are deciding for 'tonight'.
- Words in bold: There are no words in bold in the provided text. However, if we consider the context of the dialogue, words like 'expensive', 'crowded', 'cheaper', and 'quieter' are descriptive and important for their decision-making process.
c) Completing sentences with relative clauses:
- 1. Bob who doesn't want to go to Marcel's is looking for a restaurant that isn't too expensive.
- 2. There are many restaurants that are more expensive than Marcel's.
- 3. David who doesn't want to go to Castella is looking for a quieter place.
- 4. Antonio's which is cheaper than Marcel's and quieter than Castella attracts David.