The population of the city ________from less than half a million in 1949 to over two million.
The birds ran away______ all directions_______ they caught sight of a man coming near.
It is beyond my understanding that many adults ______ be so crazy about Harry Potter series.
Today, we’ll discuss a number of cases _______beginners of English fail to use the language properly.
You've failed to do what you _____ to and I'm afraid the teacher will blame you.
______ writing the article, Mrs. Curie even forgot her dinner.