The Nuclear Security Summit is an initiative of Mr. Obama, considers nuclear terrorism to be one of the greatest threats to international security.

The news inspired the whole world______ Israeli scientists have invented a kind of magic glasses_________ can let the blind see things

Would you like some coffee or tea—________. I prefer a glass of water.

___isknown to us all is that the old writer, for __________ life was hard in thepast, still works very hard in his eighties

The situation requires that the manager _____there immediately. [ ]