The black teacher set a good example _____all the rest of the group, ____all peace-loving people.

We play soccer friends after school.

_____is known to us all is that we shoulddo as much as we can ______ stop the pollution of the environment.

Are you going to __________ this challenge（挑战）

It was in the small house _______ was built with stones by his father _______ he spent his childhood.[ ]