   neutral   Ok, now some points for attention. First of all, pay attention to safety... Now, sign your names on the lab record, and after that you can start. If there is any question, just let me know.     neutral   Excuse me, sir. This air compressor doesn't work.  
    neutral   Have you turned it on?     neutral   Yes, I have.  
    neutral   Ok, I will get you another one.     neutral   
 Do not worry. Please wait a while... 
 Thanks a lot. Do you need more time?    happiness   No, thanks. We