He had been so absorbed __________ watching the carpassing by that he didn't notice his friends __________.
Jane’s grandmother had wanted to writechildren’s book for many years, but one thing or another always got in way.
——Hi, John. Are you busy? ——
The boss of the company is trying to create an easy atmosphere ______ his employees enjoy their work.
See, your computer has broken down again! It doesn'tsense to buy the cheapest brand of computer just to save a few dollars.
I wish I ______ at my sister’s wedding last Tuesday, but I was on a business trip in New York then.