Before the final examination,many students have shown      of tension.Some have trouble in sleeping while others have lost their appetite(胃口).

Teachers have to constantly update their knowledge in order to maintain their professional ___.

Not having a good ________ of English can be a serious disadvantage to achieving your goals.

Though I really enjoyed the Guangzhou 2010 Asian Games, I found it rather difficult to understand the local people because of their confusing ____.

Her boss expressed his unsatisfaction with ________she has made in the development of market.