他似乎总是另有秘密计划。

He always seems to ___have another secret plan ___up his ___sleeve.

好的老师通常备有一些吸引人的活动来抓住学生的注意力。

Good teachers often ___have a few engaging activities ___up ___their ___sleeve to capture students' attention.

在紧张的谈判中，我们怀疑竞争对手藏着一个重大的让步作为后手。

During the tense negotiations, we suspected our competitors ___had a major concession ___up ___their ___sleeve.