Find the missing words in the text to make it gramatically correct.
The car is fast, , and expensive.
The car is fast, sleek, and expensive.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find the missing words in the text to make it gramatically correct.

### Input:
The car is fast, , and expensive.

### Output:
The car is fast, sleek, and expensive.