我妹妹是个小淘气，总爱在我做作业时偷偷挠我痒痒。

My younger sister is such a ___mischievous, always tickling me secretly when I'm doing homework.

别让她看到你的作业——她最爱抄袭答案还告密。

Don't let her see your homework—she's such a ___snitch at copying answers.