The research is so designed that once _____ nothing can be done to change it.
—Will you go to Mary’s wedding party tonight? —I’m afraid not. I _______ my brother’s.
Lacking _______ evidence, the police couldn’t arrest the man.
A kind passenger paid for my ticket, without which I _______ the last train.
—I have done well in the exam because of no careless mistakes. —Congratulations! Students can never be _______ careful in exams.
With so many good friends together with you, you must have been happy during the past National Golden Week, _____?