Question

gratuitous / unnecessary

1. leaving a tip for excellent service is
2. calling your uncle \old scrooge\ was an unkind and remark.
3. the mechanic denied performing car repairs.

unnecessary gratuitous

Explanation:

• For question 10: "Leaving a tip for excellent service" is something that is not required, so "unnecessary" fits.
• For question 11: "Calling your uncle 'Old Scrooge'" is an unkind and uncalled - for (gratuitous) remark.
• For question 12: "Unnecessary car repairs" means repairs that were not needed.

Answer:

1. unnecessary
2. gratuitous
3. unnecessary