2. 公园里到处都是老人和小孩。

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3. 他没有意识到那项工作的危险。

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4. 你今天看起来很活跃。

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Key for reference

1. Many people thought he died in the road accident. But in fact he is still alive.

2. The park was alive with old people and children.

3. He wasn't alive to the danger of the job.

4. You seem very much alive today.

3. observe vt. vi. to see and notice; to act in accordance with; to make a remark 观察；注意到; 庆祝；遵守；陈述（意见）

e.g.

He observes keenly, but says little.

他观察敏锐，但是很少说话。

He observed his actions with interest.

他很感兴趣地观察他的行动。

I observed that several students were asleep.

我注意到几个学生在睡觉。

The woman was observed to follow him closely.

有人看到那女子紧跟着他。

The police observed the man entering / enter the bank.

警方监视着那男子进入银行的情况。

When driving, you must observe the speed limit.

驾车时，一定要遵守速度限制规定

Chinese all over the world observe the Spring Festival.

全世界的中国人都庆祝春节。

"The book isn't worth reading," he observed.

"这本书不值的一读，"他说。

构词解析：

observe vt. vi. 观察；注意到; 庆祝；遵守；陈述（意见）observer n. 观察者；遵守者；评论者 observant adj. 善于观察的，机警的 observation n. 观察，注意 observatory n. 天文台；气象台；观察台

Practice

Correct the following sentences.

1. I observed several girls to practice singing and dancing there.

2. The boy was observed send short-text messages by mobile phone.

Key for reference

1. 将to去掉，observe作感官动词时，其后接不带to的不定式作宾补。

2. 在send前加to，在observe的被动语态中，作主补的不定式要带to。

4. adopt vt. take over and have or use sth. as one's own, accept ; take sb. onto one's family, esp. as one's child; choose 采纳；采用；过继

e.g.