Based on the given prices of the cars in the images:
1. The price of the first car is $1750.
2. The price of the second car is $1724.
3. The price of the third car is $1713.
The sentences can be completed as follows:
- "The third car is expensive." (This is already given, although, based on the prices, it should be the least expensive.)
- "The second car is **cheaper** than the third car."
- "The first car is **the most expensive**."
The question may have intended to illustrate comparative and superlative forms accurately, but the initial sentence given seems incorrect based on the provided prices. Here is the correct comprehension according to the prices:
- The first car is the most expensive.
- The second car is cheaper than the first car but more expensive than the third car.
- The third car is the cheapest.