—Hello, I’d like to see Doctor Smith at 3 o’clock tomorrow afternoon. —Sorry, but he ________ a patient at that time.
.Among all the problems,_______is so difficult as this one.
It was 1920 ______ regular radio broadcasts began.
_____ is reported in the newspaper that talks between the two countries are making progress.
Have you any knives? I need a sharp ________.
Lucy has a great sense of humour and always keeps her colleagueswith her stories.