她想不出答案时挠了挠头。

She ___scratched her head when she couldn't remember the answer.

他在解谜时感到困惑，抓了抓头。

Confused, he ___scratched his head while trying to solve the puzzle.

小猫用爪子在地板上抓出了一道痕迹。

The kitten ___scratched the floor with its claws.

他们勉强凑够了钱买礼物。

They barely ___scratched together enough money for the gift.

他在笔记本上随手画了个草图。

He ___scratched a rough sketch in his notebook.

由于缺少参赛者，比赛被取消了。

The competition was ___scratched due to lack of participants.

他用钥匙把墙上的贴纸刮掉了。

He ___scratched the sticker off the wall with a key.