You promised your friend a letter; youought to ______ days ago.

It is the prevention of disease______its successful treatment that has led to the rapid increase of the world’s population

___ for you for two hours, but invain. Where did yougo—I ______ at my uncle’s.

Will you read me a story, Mummy? — OK. You _____ have one if you go to bed as soon as possible. [ ]

When _________ the training course begin?–Next Monday