_______, water changed into steam.
---Why does Peter look upset?--- He is a newcomer to the class and is having difficulty ______ by his classmates.
Her question was so difficult that I could hardly make any _______ of it at all.
Human beings are different from animals _____ they can use language as a tool to communicate.
The house prices fell sharply at the end of last year, but ______ at the beginning of this year.
Sam has been appointed_____ manager of the engineering department to take _____ place of George.