求解一道初中英语题。。。。

                1. —How many teachers are there in your school?
                     —______, but I'm not sure.
              A. Hundreds       B. Hundred      C. Hundreds of     D. One hundred
                2.How many teachers are there in your school?
                   ______, I think. But I don’t know the exact number.
              A. hundred B. Hundreds C. Hundreds of D. Hundreds or thousands