71． hang 意作“悬挂”时，时态变化“hang，hung，hung”；意作“吊死，该死”时，时态变化为“hang ，hanged ，hanged”。此处作“悬挂”讲，且全篇叙述都用的是过去时，所以应该使用过去式hung。 72． “warn sb of sth ”为固定搭配，所以将from改成of。 73． 定语从句中，如先行词后出现逗号，为非限制性定语从句，则关系代词应用which。 74． “tired”不是动词，是分词形式的形容词。一个句子中不可能没有谓语动词，所以填上一个“were”，因为“be tired”表示“劳累”。 75． “B.ut today ”暗示这句话应转为现在时，所以应把过去式sent改成现在时send。 76． “modern lighthouse”辩认identify 的对象是它自己，所以应该使用反身代词itself。 77． 此句意思是“light”像“giant firefly ”，as不表示“像”的意思，所以将其改成like。 78． 动词变成形容词修饰名词时，如果与名词是主谓关系，动词变成-ing形式，如果与名词是动宾关系，动词变成过去分词形式。“light”与“revolve”应是主谓关系，所以应用动名词形式revolving来修饰名词light。 79． How 与however后面直接接形容词，然后再加名词，如：How beautiful the flowers are ！what 与whatever后面直接接名词，如：What beautiful flowers！此句应用whatever，因为 其后紧跟着一个名词“the signal”。 80．and 前后句子结构对称，“which lighthouse it is ”与“where it isolated”对称，不需要being。另外，此处强调的是状态，不是动作，“being”表示正在定位于何处。
Model Composition
As can be clearly seen from the cartoon, a bird is sitting on the top of a huge ax, with tears streaming from its eyes. Because all the trees are cut down, the bird will have no habitat. The cartoon conveys the meaning that it is urgent to preserve the woods for the birds and protect the environment for human beings.
The cutting of trees, as well as the destruction of our environment, may lead to several harms as follows. In the first place, the trees provide us with many vital things we humans need, such as oxygen, food, shelter and so on. The animals, such as the bird in the picture, also need the trees. In the second place, if trees are cut down, then there will be nothing to retain the rain water, thus floods will happen more often in the future. Last but not least, there is only one earth. If the environment is destroyed, then we will have no place to live in.
Since this phenomenon causes so many harmful effects, we have to come up with some measures to deal with it. First of all, the authorities should adopt the policy of “sustainable development”, just as our government has been doing. What’s more, every citizen should realize the seriousness of the problem and make concerted efforts to protect our environment.
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