网友的问题逐个解答如下：

15. The island, joined to the mainland by a bridge, is easy to go to.

这里为什么to go to 不是to go?

——to go to 是“反射不定式”，其逻辑宾语就是句子主语 The island。注意：反射不定式必须是及物动词或及物的短语动词，如果是不及物动词，则需要有介词，如go to。

这种格式的句子结构与形容词的性质有关。如：easy, difficult, hard, great, pleasant等。又如：

The question is difficult to anwser.

He is easy to satisfy.

He is difficult to get along with.

16. More highways have been built in China, making it much easier for people to travel from one place to another.

这里it是形式宾语吗?

——是的。

17. More TV programs will be produced (by us) to raise people's concern over food safety.

其中to raise的逻辑主语是什么呢？是more tv program还是us？to raise作什么成分呢?

——to raise的逻辑主语是省略了的people或we，即网友所说的by us 中已经暗示。to raise...作目的状语，类似问题之前解答过：

14. More work needs to be done to achieve the final success.

to achieve的逻辑主语是什么呢，作什么成分修饰什么呢，more work needs to be done(by us) to achieve the final success.逻辑主语是us吗?

——to achieve the final success 作目的状语，其逻辑不是句子的主语，被省略了，应为“人”（we，people）。从被动语态by sb. 也可以看出逻辑主语是谁。

18. Michael put up a picture of Yaoming beside the bed to keep himself reminded of his own dreams.

其中to keep的逻辑主语是michael还是 picture of Yaoming? Reminded是himself的宾补吗? Of his own dreams修饰reminded?

——to keep的逻辑主语自然是句子的主语Michael。to keep himself reminded of his own dreams 作目的状语。如果逻辑主语是a picture of Yaoming，就不是目的状语，而是定语或宾补了。但是，句意不允许作定语和宾补，必须排除。

19. Do you wake up every morning feeling energetic and ready to start a new day?

Feeling是状语修饰wake，副词up修饰wake。Ready和energetic并列吗? To start的逻辑主语是谁，做什么成分呢。还是构成ready+不定式形容词短语？

——分析成分注意意群，不要拆开。feeling energetic and ready to start a new day 整个现在分词作伴随状语，其中energetic and ready 作并列表语，to start a new day是目的状语，其逻辑主语自然是句子主语you。