What is a person who does things carefully and completely called?

If someone is talking and you have to cough really bad but don't want to interrupt when is the appropriate time to cough? Is Mr Smith's a possissvive noun? Why do some boys have such poor table manners? What does unassuming mean? What should you right at the top of a letter apart from your address? How do you say greetings in portugese? What to write in a letter to a friend whom you r going to see after a long time? What is the difference between a formal and informal interview? How do you welcome a person? Why do people say ummm a lot? Who made up the phrase G'day? What does the name maisy mean? Why are some people so quiet? What pieces does a full place setting include? How those germs affect to people? How do people in portuguese greet each other? How do you combat when someone says you are annoying? How many times do people clean their toilet a month? Can you use gentleness in a sentence? Can you give me an eXample of an acknowledgement?