The villagers were warned ______ the water from the river polluted by the chemical works..
. When asked why he went there, he said he was sent there ____ for a space flight.
. They desired that they _____ the right to vote.
. He was about to go out for a walk _____ his teacher came to visit him.
.With no one to ______ in such a frightening situation, she felt very helpless.
. He began to take political science _________ only when he left school.