Take a look at the sentence again:
While crawling along in rush-hour traffic, Kay cranked up her car stereo
and __________ the lyrics to "Back in Black" with AC/DC, oblivious to the
scowls of annoyance from the other drivers trapped beside her.
The sentence requires the simple past of sing, an irregular verb. Sang is the simple past form.
| Verb | Simple Present | Simple Past | Past Participle |
| sing | sing(s) | sang | sung |
Singed, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.
Try again to escape Grammar Hell!