We must do all we can make our world better.

Are there any alive things on the moon?

The milu deer had been very common in China, but it was disappeared during the Ming and the Qing Dynasties.

Professor Stevenson, who has devoted himself to protect the milu deer, gave a talk in Beijing.

With the days went on, the weather got worse.

We may be able to take measures after it is too late.

Steve is an expert who tries to keep animals and plants from becoming endanger.

Having a cell phone makes us to feel safer in case of an emergency.

The teacher wanted to teach the students all that he knows in the last lesson.

Why didn’t go to my birthday party last night?