题目内容：

根据中文或首字母提示填入适当单词，或用所给词的正确形式填空。

1.People _______(挥手)goodbye on Tuesday to students on a bus who were about to take the college entrance examination.

2.As to the issues, we should analyse them __________.(concrete)

3.The results prove that the new drugs are_________(effect) against cancer.

4.Leaders who are accustomed to __________(滥用)their power shall be punished.

5.Many natural ___________ (现象) cannot be explained.

6.The school sees its job as preparing students to make __________ (contribute) to society.

7.As is the case with any challenge we have ever faced, I have a_______(绝对）no doubt that we will solve it successful.

8.If you’re worried about your study,share your __________(anxious)with your teacher.

9.He was _______(ban) from taking part in matches for three months after failing a doping test in the previous week.

10.The Palace Museum in Beijing has been in  ________(exist) for more than 500 years.