In manufacturing, cheaper materials are constantly being for the better, more expensive kind.
You _______ an A on your term paper, but you quoted a little bit more from others' papers.
Tom looked upon the test as an obstacle _____ his classmates regarded it as a challenge.
You don’t have to ______every little incident in your life.
--Why are they _____ the forest? --They are _____ a thief.
Facing the enemies, Liu Hulan ______ .