8.Scientific knowledge has greatly ______________(进步) since the 19th century.

7.They realized there was some _______________ (潜在的) danger behind the case.

6. All letters must be written p___________. That is to say, you’ll have to write them yourself.

5. He has been a________________ to keeping early hours.

4. When speaking, we should be b___________ and to the point.

3.Would you like to fill in this q___________ for me? I’m conducting a survey.

2. Aspirin can reduce the risk of heart attacks by t__________ blood.

　 根据汉语或英语首字母写出该单词的完整形式：

1. It surprised the manager a lot that the company received so many a______________ for only a vacancy(空缺).