3. 他发现不可能离开德国去美国了。

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4. 我觉得我有责任帮助你。

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【答案】

1. make it a rule

2. find it hard

3. He found it impossible to leave Germany for the USA.

4. I think/find/feel/consider it my duty to help you.

【解析】本题主要练习重要句式it作形式宾语的用法。

3. But when I tried to step forward I found I was carried twice as far as on the earth and fell over.

而当我试着向前迈步的时候，我发觉我被送出去很远，步子的跨度竟是地球上的两倍，因而我摔倒了。

　　twice as...as... "是......的两倍"，英语常见倍数的表示句型：

(1) 倍数+as+adj./adv.+ as "是......的几倍"。

My room is twice as large as his.

(2) 倍数+adj./adv. 比较级+ than "比......(多/大)几倍"。

My room is twice larger than his.

(3) 倍数+the+表示长度/高度/宽度等的名词+ of "是......的长度/高度/宽度几倍"。

My room is twice the size of his.

　　此结构中常用的名词有：size, height, weight, length, width depth等。

This ruler is three times as long as that one.=This ruler is three times longer than that one.=This ruler is three times the length of that one. 这把尺子是那把的三倍那么长。

There are four times as many students as we expected. 到的学生是我们预计的五倍。