The conference has been held to discuss the ________of global warming on people’s lives all over the world.

. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.

—She got her first science fiction published．It turned out to be _________.—when was that? —It Was in 2008__________ she was still in college．

This had a great ____ the future of both mother and son.

My trousers are too old.I’ll have to buy ____.