Not until I began to work ________ how much time I had wasted.
The sign over there says that no person ______ enter the area without official permission.
Ten years ago the population of our village was ______ that of theirs.
The English spoken in the United States in only slightly different from ______ spoken in England.
– Do you think Jim can manage it on his own?– ______. He is expert at dealing with such matters.
You’d better report the accident immediately to ______ is in charge of the project.