1. There is no doubt that effective teachers know their subjects thoroughly
sthe needs of their students.
2. Einstein said hespacehad always believed that the invention of scientific concepts and the building of theories upon them was one of the great creative properties of the human mind.
3. Rabbits make their homes in fields and prairies where they can hide their young under bushes or among tall grasses.
4. Individuals exposed to loud noise for long intervals may suffer temporary or permanent loss of hearing.