As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.
A person ____ e-mail account is full won't be able to send or receive any e-mails.
The child wants to ____ the watch to see what makes it work.
During the Second World War, once before, the U-boats had been _____ because of air attack.
The reason _____ he was late for the meeting is _____ his car broke down on the road.
—I knocked over my coffee cup. It went right over _____ keyboard. —You shouldn’t put drinks near _____ computer.