Read the following passage and mark the letter A, B, C, or D to indicate the correct word that best fits each of the numbered blanks.
The relationship between students and teachers is less formal in the USA than in many other countries. American students do not stand up ___(1)___ 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 ___(2)___ students to enter class late or leave early if necessary. Despite 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 ___(3)___ a hand 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 who are talking to each other ___(4)___ a test are cheating.