as soon as和once的用法区别

as soon as和once的用法区别
asso0nas和once意思完全不同，它们的区别是：
1. HN SoIL lIk“-……就”的意思，强调时间的紧张，

如
As soon as he got there. he began to work.

他一到那儿就开始工作，
The students were quiet as soon as the teacher came in.
老师一进来，学生就安静下来。

2.once“一旦”,带有条件的意味，所引导的句子往往放在句首，

如：

Once you saw this film, you'll never forget it.
且你看了这部电影，你就水远不会忘记它
Once you' re here, listen to your teacher.

一到这里，就要听老师的话。

请选用as soon as、once词语的适当形式填空
1) Shoot      the enemy reach the foot of the hill
2)      you show any fcar, he will attack you
3) You won' t find it difficult        ou have understood

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