It is generally believed that teaching is ______ it is a science.
All of us didn't notice Tom come into the classroom because the light happened to ________ at that time.
“Neal, listen,” she said, looking straight at him. “I ask you not to get ________ in this kind of matter. It's none of your business.”
He ignored the neighbor's request that ________ less noise at night.
There are a great number of natural resources in the desert, which remain to be ________.
Everything ________ into consideration, they thought the car was good enough though it was heavy on oil.