---Who can it be that hasn’t handed in his composition?---It ______ be Robinson. He ______ it in yesterday.
He came up with a new ______ to the problem at yesterday’s meeting.
Our water supply has been ______ because they are repairing one of the main pipes.
There are _________ flowers shown in the park and _______ people go to have a look.
_____ he referred to in his article was unknown to the general readers.
--What do you think made Celia so happy? --______ a prize in the recent competition.