Cách sử dụng
The expression "fill in" means to complete or add missing information or details. It can be used in many different situations, such as filling in a form or questionnaire, filling in the blanks on a test or worksheet, or filling in a crossword puzzle. In general, it is used to describe the act of providing information that is missing or incomplete. For example, if someone asks you to fill in a form, they are asking you to provide all the necessary information on the form so that it is complete. Similarly, if you are asked to fill in a crossword puzzle, you are being asked to provide the missing words or letters so that the puzzle is complete.