In ____late 19th century, Europe changed ______great deal and was playing important roles in ______international trade.
This is the only way that I can think of _______ the problem of water waste in urban areas.
I’d appreciate ______ , to be frank, if you would like to teach me how to use blog and twitter on the Internet.
I crossed the street to ______ her, but she saw me and came running towards me.
As the price is rising, $100 a month can hardly _____ the cost of his life in such a big city.
________it is to throw snowballs at each other on the playground after snow!