Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 1 to 5

In Germany, it’s important to be serious in a work situation. They don’t mix work and play so you shouldn’t make jokes (1) __________ you do in the UK and USA when you first meet people. They work in a very organized way and prefer to do one thing at a time. They don’t like- interruptions or (2) __________ changes of schedule. Punctuality is very important so you should arrive on time for appointments. At meeting, it’s important to follow the agenda and not interrupt (3) _________ speaker. If you give a presentation, you should focus (4) ________ facts and technical information and the quality of your company’s products. You should also prepare well, as they may ask a lot of questions. Colleagues normally use the family names, and title - for example ‘Doctor’ or “Professor”, so you shouldn’t use first names (5) _________ a person asks you to.

 (4) A. on                 B. to                C. at                D. in