空气滤清器的作用是把空气中的（）清除掉，以免进入气缸中加剧机件磨损。

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小题1: Lucas is experiencing the hardest time in life these days. As manager of a trade company, he is responsible for the loss of a big business contract as he made a wrong decision. He wonders whether he has the ability to be a good manager, and he’s even considering leaving his job. He doesn’t know what to do and badly needs help.
小题2:Whitney has been out of work for several weeks now since she left her last job. She has been trying to find another one, but with no luck. She urgently needs a new job, so she’s searching for advice on how to make the best use of her time so as to successfully get a job.
小题3:After a job interview, Ralph was told that the company would like to have him as one of its staff. He would sell the company’s products if he worked there. However, he’s not sure whether he is good at selling things or not, so he’s looking for a way to find out about this before taking the job.
小题4:Thomas Howard is 23 years old, working at a gas station. He earns little money every week, feels that his life is hopeless, and never thinks that things will be better for him. His mother is worried about this and wishes to find a way to inspire her son.
小题5:Katrina is quite worried recently, because her manager seems to be turning on her, criticizing her in front of her colleagues for things that she does quite well. What’s worse, he even tells others that she has several boyfriends at the same time, which is of course not true. She really wishes to find a way for her problem.