1.   I made a few careless mistakes.

2.   It was a careless mistake.

3.   He rushed through his work and made a lot of careless mistakes.

4.   But while he was leading by a wide margin, he made a careless mistake and lost.

5.   If Vargas makes careless mistakes looking for a quick knockout, Trinidad is almost certain to take advantage.

6.   It was the kind of careless mistake that is not supposed to happen.

7.   Their defense played superbly, but they still showed an astonishing penchant for careless mistakes.

8.   UCLA made too many careless mistakes in a game the Bruins were supposedly motivated to win as redemption for their loss to Miami.

9.   Week in, week out, the Giants keep making the sort of careless mistakes that come from not being familiar with the manual they tossed away.

10.   During the last set, the Center Court crowd at the Foro Italico began whistling in derision at his careless mistakes.