There are 15 million young people __from___ different countries who study man and the living things __with___ him.
They take steps to prevent pollution __from___ the air,___from_ the land and _from_the__ sea.
The sory is composed _of___ two parts.
Virginia was named __after___ the Virgin Queen.
He made for the door __at__ the sight of his mother.
The electric heater no longer gives _off___ heat.
It will be a long time before he comes __back__.