1. concern
n. ①关心，担心：The boy showed no concern about what his sister was doing.
②关系，关联：This problem is of great concern to all of us.
③关切的事，有关的事：What are your main concerns as a writer?
vt. ①和…有关，涉及.关系到：He doesn't bother about things that don't concern him.
②(with)使担心，使挂念：Don't concern yourself about what he says.
as/so far as…be concerned 就…而言
be concerned with 关心，挂念，从事于
2. conclude
vt./vi. ①推断出，推论出：The scientist examined the data and concluded that the theory was invalid(不正确).
②结束，完结：The movie concludes at ten o'clock.
③缔结，议定：It was concluded in the meeting that he should be dismissed.
conclusion
n. ①结尾：at the conclusion of the ceremony 在仪式终了时
②缔结，议定：the conclusion of a peace treaty 和约的订立
③结论，推论：You should not jump at conclusions.
in conclusion 最后，总之
3. conduct
n. 品行，举止
②引导，带领: The students are conducted to do experiment.
③传导(电、热)： conduct heat or electricity.
4. conference
n. ①商议，会谈：The director is in conference now, you can see him later.
②(正式)会议，讨论会：There's a room where they hold conferences.