新任经理不得不向不服管束的团队展示他的权威。

The new manager had to ___assert ___his authority over the unruly team.

对于老师来说，从第一天起就在课堂上确立自己的控制力很重要。

It's important for a teacher to ___assert ___her control in the classroom from day one.

这个国家为摆脱殖民统治、维护自身独立而战。

The nation fought to ___assert ___its independence from colonial rule.