【C15】A．TeachersB．DoctorsC．ResearchersD．Workers

A．monitorsB．doctorsC．nursesD．researchers

【C7】A．teachersB．classmatesC．partnersD．students

A．victimsB．participantsC．researchersD．partners

A．Farm workers.B．White－collar workers.C．Blue－collar workers.D．Not mentioned.

Which group of people make some efforts to help pupils in elementary schools？A．TeachersB．R

There are 40 teachers in this school,ten of whom are______.A．man teachersB．men teacherC．ma