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 19 to 24.

The relationship between students and teachers is less formal ___(1)___ the USA than in many other countries. American students do not stand up ___(2)___ their teachers enter the room. Students are encouraged to ask questions during class, to stop in the teacher's office for extra help, and to phone if they are absent. Most teachers ___(3)___ students to enter class late or leave early if necessary. ___(4)___ the lack of formality, students are still expected to be polite to their teachers and fellow classmates. When students want to ask questions, they usually ___(5)___ hands and wait to be called on. When a test is being given, talking to a classmate is not only rude but also risky. Most American teachers consider that students ___(6)___ are talking to each other during a test are cheating.