6.　　　 The only means of a___________ to the building is a muddy track.

5.　　　 _________ (预防) is better than cure.

4.　　　 My parents are both laid-off workers. We have no r_________ income.

3.　　　 When the dog came toward me, I picked up a stick to d__________ myself.

2.　　　 He gave her a _________ (意味身长的) look.

根据以下各句所给的首字母或汉语提示，用单词的正确形式填空，并将完整的单词写在答题卷上。

1.　　　 To e __________ safety, the train is controlled by an advanced computer system..