第一节 单项填空（共15小题；每小题1分, 共15分）
21. What’s up, Bill? You __________upset.
A. look B. looked C. have looked D. had looked
22. __________patient when you argue with someone who is not so reasonable.
A. Be B. Being C. To be D. Having been
23. It is more important than ever to develop one’s maths, science and computer skills __________technological change is accelerating.
A. though B. unless C. until D. because
24. While looking for some personal documents, I happened to see an album __________some old photographs.
A. contained B. to contain C. containing D. being contained
