（) you work hard, you will certainly succeed.A. ThoughB. IfC. BecauseD. For

听力原文：W: Were you hard－working when you were in high school, David？M: Yes, I studied ha

If you had worked hard, you______so anxious now.A．would not have beenB．would not beC．will

This kind of work is hard and dangerous. But______you would become rich.A．would you succee

You’ll have more chances of promotion ______ you work hard.A、sinceB、whileC、asD、once

You and I could hardly work together, ？A. could you B. couldn’t I C. couldn’t we D. co

You must work hard to keep your brain active just