If nothing ________, the oceans will turn into fish deserts.
When you get your paper back, pay special attention to ______ have been marked
They didn’t turn up at the meeting yesterday. Otherwise, they _________ the report.
Johnson, to grasp the chance to become a doctor, decided to take up teaching.
Having been out of touch with his parents for two years, John returned home,
Written in a hurry, ______. How can it be satisfactory?