—I’d like a pen which _________ well.—Will this one _________?
He is so busy. He cannot afford enough time with his son _______ he wants to.
Mark needs to learn Chinese _______ his company is opening a branch in Beijing.
_________I have to give a speech, I get extremely nervous before I start.
In the global economy, a new drug for cancer, ______ it is discovered, will create many economic possibilities around the world.
Anyone, once ____ positive for H7N9 flu virus, will receive free medical treatment from our government.