1. One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
A. are; have B. is; has C. is; have D. are; has
2. The number of teachers in our college _____ greatly increased last term.A number of teachers in this school _____ from the countryside.
A. was; is B. was; are C. were; are D. were; is
