—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The woman sold the eggs ________ seven dollars and they were sold ________ half price.
I’ve kept up a friendship with a girl whom I was at school ________ twenty years ago.
In the experiment we kept a watchful eye ________ the developments and recorded every detail.
Books are the most important records we keep ________ man’s thoughts, ideas and feelings.
I don’t think it’s fair to judge a person ________ their clothes.