______ and short of breath, Andy and Ruby were the first to reach the top of Mount Tai..
_____ all the inventions have in common is ______ they have succeeded.
The new machine,if _________ properly,will work at least ten years.
—What were you doing when the telephone rang? —I ______ away my books and ______ to bed.
I thought Jim would say something about his school report,but he ______ it.
We found______ impossible to finish the work on time.