Toobtainasatisfactoryresult，onemustapplytwo____ofpaintonacleansurface.

He left orders that nothing _____ touched until the police arrived there.

She hired a lawyer to investigate, only to learn that Gabriel had removed her name from the deed.The infinitive verb phrase “only to learn ” is used ____.

_____ for the fact that she broke her leg, she might have passed the exam. 

Modern（）perhaps causes more problems than it solves.