He got well-prepared for the job interview, for he couldn't risk ______ the good opportunity.
—Why did you leave without a word of warning to John?—But what _____ otherwise? He never listens to me.
Mary often stays up, reviewing her lessons, books___ all over the desk.
—Look, the paint is starting to come off ____ the wall is damp.—Well, we'd better have the wall repainted some day.
If you ___ stick to the unrealistic approach, the worse result will be waiting for you not far ahead.
The petrol in the car ____ on our way to the beach, so we had to walk there.