Ⅰ.根据句意及首字母或汉语提示,用单词的适当形式填空
1.The memory of the accident will never f from her mind.
答案:fade
2.He did not know
from which part of Africa his (祖先) had come.
答案:ancestors
3.The river is the b between the two countries.
答案:boundary
4. (原始的) men made tools from sharp stones and animal bones.
答案:Primitive
5.We all hope for (永久的) peace.
答案:permanent
