点津：

词根serve表示serve,表示服务。

Conserve:保护, 保藏, 保存

Conserve your energy, you'll need it!

保存你的精力, 你会用得着的！

Deserve:应受，值得

What crime have they committed to deserve such cruelty?

他们犯了什么错，竟遭如此惩罚？

Observe：观察，研究；遵循

He observes carefully but says little.他总是仔细观察, 很少说话。

Preserve：保护；维持

We must preserve our natural resources.我们必须保护自然资源。

答案：Conserve, deserve, observe, preserve

Efforts to conserve the environment sometimes clash with the advancement of technology.

致力环境保护有时和发展技术相矛盾。

He can't deserve you.

他是没有资格匹配你的。

As a child, he liked to observe the behaviour of insects.

他小时候喜欢观察昆虫的习性。

It is highly important to preserve the environment.

维护自然环境至关重要。