Operations which left patients ______ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.

On receiving a phone call from his colleague ____ the suspected criminal had shown up, the police officer left home immediately.[ ]

ion, coffee lovers! We have for you, the best coffee machine_____ invented.

More than fifty students competed _______each other in the composition competition—But they could only compete _______three medals

His wife has left him, but he behaved _______ nothing had happened.