男孩们调皮地把老师的粉笔藏了起来，显然又在搞恶作剧了。

The boys hid the teacher's chalk, clearly up to some ___pranks again.

当她的男友发现她同时和多人约会时，终于意识到她在玩花招。

Her boyfriend realized she was up to some ___hanky-panky when he found out she was dating multiple people.