—What are you doing, John? Why stop?—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way.
After careful consideration, he decided to take the position, ______ he knew it would be difficult for him.
The teacher handed our writings back to us, ______ some necessary changes.
You must ______ that the power is off before you leave the lab.
At such gatherings, people ______ are not necessarily your relatives or friends.
—We’d better go downstairs right now for lunch.—______ They serve food 24 hours a day.