He looked at those jewels one after another ______and seemed to show no interest in any one of them.
-----Are you happy with your new computer? ----- No, it is _______ me a lot of trouble.
If you really have to leave during the meeting, you’d better leave ____ the back door.
—Did the book give the information you needed?—Yes. But _____ it, I had to read the entire book.
The companies are working together to create they hope will be the best means of transport in the 21st century.