He came here in the hope　　　he could learn about the cause of the accident.

She is such a woman who is always __________ fault with the way others do things.

I want to know ________ next week，Mum.—If I know about it, I will tell you at once.

_______ that they may eventually reduce the amount of labor needed on construction sites by 90 percent.

Many students listened to the lecture, butI wondered how much they ______.