In the past decades, sea ice ______ in the Arctic as a result of global warming.
The Turners consider ________a computer, which is commonly considered _____a great help in our work and study.
How cold it is ! We’ve never had ________this winter.
It was at the very beginning ______ Mr Smith made a decision _____we should send for a doctor.
——I’m afraid I can’t finish the magazine within the required time. ——__________.
—Excuse me, Professor Smith, I was wondering if I could leave a quarter earlier today. — _____ .