----What ________ the number of the students in your school?      ---- About two thousand. A number of them _______ from America.

The teacher as well as the students who_____fond of football,_____ playing together.

There are usually 28        in a person’s mouth, so we should listen to the doctor’s ______ to protect（保护）them.

The Japanese          suffering from the worst natural disasters         .   

.One out of three villagers                  a new school in the village.