__________ to sun, rain and wind for a long time, the stone split.
| A．Being exposed | B．Having exposed | C．Exposed | D．To expose |
（2011福建卷,26﹚The lack of eco-friendly habits among the public is thought to be a major of global climate change.
| A．result | B．cause | C．warning | D．reflection |
Anyway, I can’t cheat him—it’s against all my ____.
| A．emotions | B．principles | C． regulations | D．opinions |
Teachers have to constantly update their knowledge in order to maintain their professional _____.
| A．consequence | B．independence | C．competence | D．intelligence |
We’d better discuss everything _______ before we work out the plan.
| A．in detail | B．in general | C．on purpose | D．on time |
There’s a _____ in our office that when it’s somebody’s birthday, they bring in a cake for us all to share.
| A．tradition | B．balance | C．concern | D．relationship |