第一节：单项填空（共15小题；每小题1分, 满分15分）
21. _______ basic first-aid techniques will help you respond quickly to emergencies.
A. Known B. Having known C. Knowing D. Being known
22. I suggest you not be too ____ about what you eat, or you are likely to develop an unbalanced diet.
A. proud B. particular C. confused D. considerate
23. As the light turned green, I stood for a moment, not _____ and asked myself what I was going to do.
A. moved B. being moved C. to move D. moving
24. All the scientific evidence ___ that increasing use of chemicals in farming ____ damaging our health.
A. show; are B. shows; are C. shows; is D. show; is
25. I am not used to living in the Middle East, because they have too many religious festivals to ____.
A. observe B. keep C. follow D. respect
26. Progress so far has been very good. We are, _____, confident that the work will be completed on time.
A. besides B. however C. otherwise D. therefore
27. ---Allen said something hard to understand at the conference.
---Yes, her remarks left me _______ about her real purpose.
A. wondering B. to wonder C. having wondered D. wondered
