I cannot choose but wait.

我别无选择，只好等待。

I cannot choose but tell him the truth.

我不得不告诉他真相。

We cannot choose but attend their wedding.

我们只好参加他们的婚礼。

There is no bus running. I cannot choose but walk.

没有公交车；我别无选择只有步行。

I cannot choose But to ask you to leave this university.

我不得不要求你离开这间大学。