You have to be accurate in this job，because a small mistake can make a big ________.
| A．difference | B．difficulty |
| C．trouble | D．change |
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 |
The Harry Potter books are quite popular; they are in great ______ in this city.
| A．quantity | B．progress | C．production | D．demand |
He will come to understand your efforts sooner or later. It’s just a matter of _____.
| A．luck | B．value | C．time | D．fact |