In summer people usually stay up late outside, ______ the cool air.
It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
An awful accident, however, _____occur the other day.
It was probably at that moment _____ I understood what kindness really was.
—What was it that caused the party to be put off?—________ the invitations.
Who ________ that played a trick on the new English teacher?