阅读短文，从下列中选择适当的词并用其正确形式填空，使短文通顺、意思完整。每空限填一词，每词限用一次。

year    wide    they    build    rush    on    because    clean    example    produce

China is trying its best to use clean natural energy (能源) to protect the environment. Although some clean energy technologies are still expensive, China continues to develop ____36____ to meet people’s needs.

For example, wind energy is ____37____ used. We can see tall wind turbines on grasslands, mountains and even on the sea. Wind energy is one of the ____38____ energy sources (来源). People have found that wind power works better in open areas.

Another ____39____ is solar energy. Solar panels (太阳能电池板) are placed on mountains, open lands and building rooftops. They take in sunlight and turn light energy into electric power. Solar energy works easily ____40____ sunny days. When the weather is fine, it can provide enough electricity for a whole house.

Water energy is also used in many places. China has ____41____ many large dams (水坝) on big rivers. The water falls down from high places and ____42____ fast, driving the machines to make electricity. Water power is friendly to nature and dams can serve people for many ____43____.

Besides, tidal (潮汐的) energy is another way to make electricity. The sea has rising and falling tides every day. When the tides move, we use their force to ____44____ energy.

All these forms of green energy will hardly run out ____45____ they come from nature. China keeps developing clean energy to build a greener future.

1.36.

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解析：选them。人称代词（主格变宾格）。动词develop后面需要接宾语。代词指代上文中复数名词clean energy technologies（清洁能源技术）。they是主格，只能作句子主语；作动词宾语必须改为宾格them。句意：中国继续研发它们，来满足人们的需求。

2.37.

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解析：选widely。形容词变副词。本句谓语是被动语态is used（被使用）。副词用来修饰动词，形容词不能修饰动词。wide形容词 “宽的”，副词形式widely“广泛地”。固定搭配 be widely used 被广泛使用。句意：例如，风能被广泛使用。

3.38.

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解析：选cleanest。形容词最高级。固定句型：one of the + 形容词最高级 + 可数名词复数，译为 “最…… 之一”。the后面要接形容词最高级。clean的最高级变化为规则变化，直接加est →cleanest。句意：风能是最清洁的能源来源之一。

4.39.

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解析：选example。名词原形。前文出现For example（例如），本句Another后面接可数名词单数，another example为固定表达 “另一个例子”。词库给的example直接使用，不需要变形。本段开始举第二个例子 —— 太阳能。句意：另一个例子就是太阳能。

5.40.

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解析：选on。时间介词。表示具体某一天或者带有形容词修饰的日子，介词用on。sunny days（晴朗的日子）是带修饰的日子，所以填介词on。辨析：in 用于月份、季节、年份；at 用于具体时刻。句意：在晴天，太阳能很容易发挥效用。

6.41.

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解析：选built。动词：现在完成时（过去分词）。句子有助动词has，时态为现在完成时：have/has + 动词过去分词，表示已经完成的动作。build（建造）属于不规则变化：buildbuiltbuilt，过去分词是built。句意：中国已经在大江大河上修建许多大型水坝。

7.42.

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解析：选rushes。动词：一般现在时，第三人称单数。and连接两个并列谓语，前面动词为falls down（一般现在时三单），本空时态保持一致。主语the water（水）是不可数名词，视作第三人称单数。rush以sh 结尾，三单加es →rushes，意思 “奔流、急速流动”。句意：水从高处落下并且急速奔流，驱动机器发电。

8.43.

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解析：选years。可数名词变复数。many（许多）后面必须接可数名词复数。year是可数名词，复数直接加s →years。固定短语for many years许多年。句意：水力发电对自然友好，水坝可以为人们服务许多年。

9.44.

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解析：选produce。动词原形（非谓语 to do）。固定结构 use sth. to do sth. 利用…… 去做某事。to是不定式符号，后面必须使用动词原形。produce energy译为 “生产、产出能源”。句意：当潮水流动的时候，我们利用潮水的力量来产生能源。

10.45.

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解析：选because。连词（原因状语从句）。逗号前：All these forms of green energy will hardly run out（所有这些绿色能源几乎不会耗尽）；逗号后：they come from nature（它们来自大自然）。后半句是在解释前半句的原因，表因果关系，用原因连词because（因为）。句意：所有这些绿色能源几乎不会耗尽，因为它们来自大自然。