It was not until 1920 ______ regular radio broadcasts began.
There was no signal in that faraway village and all my attempts ________ you failed.
________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
People spend many years learning about favorite sports and ________ how to do them well.
In April, thousands of holidaymakers remained ________ abroad due to the volcanic ash cloud.
Today we have chat rooms, text messaging, emailing ... but we seem ________ the art of communicating facetoface.