______ has already been pointed out, only by correcting mistakes, can you make progress.
--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.