根据句意和汉语或首字母提示，填写单词。

1. Our head teacher _____ (提供) us some useful advice.

2. You shouldn't _____ (拒绝) to help him with his English study.

3. My grandma _____ (遮盖) the table with a cloth just now.

4. The experience as a volunteer is _____ (有帮助的) to him.

5. Lisa got dressed and ran _____ (顺楼梯而下) quickly.

6. She fell down and hurt her right k _____.

7. He put all the books on the s _____.

8. The old farmer dug (挖) a hole two feet d _____.

9. Your answer to the question is not c _____.

10. —What's wrong with you?

      —My arms h _____.

资产证券化过程中的关键环节是( )。

A．信用评级环节

B．信用增级环节

C．组建SPV环节

D．资产真实销售环节