Many instructors believe that an informal, relaxed classroom environment is【C1】______to le

arning and innovation. It is not uncommon for students to have【C2】______and friendly relationships with their professors. The【C3】______professor is not necessarily a poor one and is still【C4】______by students. Although students may be in a(n) 【C5】______position,some professors treat them as【C6】______. However, no mat-ter how【C7】______professors would like to be,they still are in a position of【C8】______. Professors may【C9】______social relationships with students outside of the classroom, but in the classroom they【C10】______the instructors role. A professor may have coffee one day with students【C11】______the next day expect them to【C12】______a deadline for the【C13】______of a paper or to be pre-pared【C14】______a discussion or an exam. The professor may give【C15】______attention outside of class to a student in【C16】______of help but probably will not treat him or her differently when it【C17】______evaluating school work. Professors have several roles【C18】______students;they may be counselors and friends as well as teachers. Students must 【C19】______that when a teacher s role changes, they must appropriately【C20】______their behavior. and attitudes.

【C1】

A．instructive

B．conducive

C．constructive

D．healthy