Definition: to make a serious promise or decision Level: C2
她发誓再也不会离开孩子们了。
She ___vowed that she would never leave the children again.
我已经发誓再也不去那里了。
I've ___vowed never to go there again.
在那次事件之后，他发誓再也不踏进体育场一步。
After that episode, he ___vowed that he would never set foot in a stadium again.
