How could you be so rude as to walk in here in the middle of my class?—_____________
On his way to the airport, it ________ him all of a sudden that he had forgotten her birthday.
The meeting will begin soon. Please get ready ________ it.[ ]
Our teacher wants us to be ______ when we talk with the foreigners.— Yes, we should believe in ourselves.
________of the chemical factories in their city _________pouring waste water into the river. It’s too dangerous.