1. The situation comedy has proved to (+be) a remarkably durable commercial television format.(1)____

译文：情景喜剧已经被证明是一种相当持久的商业电视形式。

1．分析：to∧→be。考查习语。“prove to be+名词”是固定结构，表示“证明是……”，此处缺be。

2. Almanacs in simple form have been known from (since) the invention of writing.(2)____

译文：简单形式的年鉴从书写发明以来就已经为人所知了。

2．分析：from→since。考查词汇。since和from常易混淆。由have been known知道此句是现在完成时态，应想到时间状语用since引导，不能用from。

3. It has not been determined how (+many) years sea turtles can live in their natural environment, but they will reach a very old age if left undisturbed by humans.(3)____

译文：还不确定海龟能在自然的环境中存活多少年，但如果不受人类干扰的话，它们可以活很久。

3．分析：how∧→many。考查引导词。how是副词，后面不能直接加名词，应改为how many years。

4. A patent gives inventors exclusive rights to their inventions for a fix (fixed) period of time.(4)____

译文：专利给予发明者一段特定的时间独享他们的创造成果。

4．分析：fix→fixed。考查词性。fix是动词，这里要用形容词fixed修饰名词period。