The traffic problems we are looking forward to seeing _____ should have attracted the government's attention.
We will work __________ those who have cheated in the exam and help them do right.
The hall began to fill up with people __________.
_________ is known to all that he can't answer the question __________ he found the money.
I would gladly pay __________ for the book, because it is quite a use- ful one.
__________ with the size of the whole earth, the highest mountain does not seem high at all.