--The river used to be clean. How does it become dirty? -- There are many factories ________ waste water into it. A. pouring B. pour C. poured
I am sure that we can do our job better with______ money and _________ people.
Welcome to our hotel! I hope you’ll have a good time _________ your stay here.
_________ useful information it is!
Helen is my friend. She is in ______ at Beijing No.11Middle School.
.Beijing is bigger than ___________in Anhui.