_________(57)A.teacher B.instructorC.lecturer D.p

_____ a teacher in a university, it is necessary

_____ a teacher in a university,

Jean is a teacher of ______ .A．computerB．artC．mathematicsD．natural sciences

_________(58)A.suggestion B.commitmentsC.ways D.p

_________(54)A.terrible B.possibleC.enjoyable D.p

_________(64)A.portion B.fractionC.proportion D.p