One way to understand thousands of new words in gain _____good knowledge of basic word formation.
--Could you help me with some math problems?--Sure. That’s _______ I’m here.
What _________ pity you didn’t go to ______ concert with us! It was so exciting!
—You cough so badly recently. Give up smoking, please!—__________. I think I am addicted to it.
Clever marketing and hard work ________ —— the company’s profit hit a million dollars.
I don’t think we are facing a communication problem. _________ , we are communicating more smoothly than ever.