. ___ to nuclear radiation, even for a short time may produce variants(变异体)of genes in human bodies.
The war against Iraq and the suffering _____caused have become a big concern all over the world.
In the school where I study English ________ .
He asked me ________ the likely result of the matter will be.
The way he thought of _________ living is to work for them.
Tom’s farther, for ________life had once been very hard, got success later in his job.