Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is Set 1, when Set 2 is "21:18"?

### Inputs:
table_name: table, columns: ['Date', 'Score', 'Set 1', 'Set 2', 'Total']

### Response:
SELECT Set 1 FROM table WHERE Set 2 = 21:18