Age, to most British and American people, is one of the things considered not  to ask a stranger or a person that one does not Know well.   age, other things such as one’s income（收入）, marriage, and politics are   not fit to ask or talk about.
There are still other     for you to understand the westerners and to   on well with them. If you want to     one’s bedroom, you have to ask for permission at first, and you must not open the desk or the closet in that    . On the top of the desk, there may     letters, business papers or other things. You must not     up one of these and read it. It is the     as in an office. If it is somebody else’s office, always ask, “May I come in?” and wait for the answer before entering the office.