在下列各句的空白处填入一个最恰当的单词,使句子意思完整,语法正确。

1.  My teacher always encourages us to_______challenges bravely.

2.  "You'd better not make the same_______,"said the teacher angrily.

3.  I have much_______learning English. Can you help me?

4.  At the cnd of the_______students will have an important final exam.

5.  It's a_______between you and me, so don't tell others.

6.  1 wonder how to________ with such a difficult problem.

7.  Many people________their lives in the earthquake.  We felt very sorry about that.

8． - Are we late?

        -I'm_______so.

9.  Miss Li is very kind to us.  She______us as her own children.

编制新的统计调查方案，必须事先试点或者征求有关地方、部门和基层单位的意见，进行可行性论证，保证切实可行，注重调查效益。（）