Mary is one of the girls who _____ often late for school.

For  _______information about present national boundaries, we’d better refer to an up-to-date map.

The population of China___ to many times what it was in 1949, and most of its population ___ farmers.

My sister and I ________ in No.7 Middle School.,

I wonder whether the teacher is one of those who _______ to the mountain village to help the children there.