A.Water is different from almost all other substances on earth because of its chemical structure.

B.The chemical structure of water ______ ______ ______ from almost all other substances on earth.

A.What makes the ocean such a great place to live?

B.What ______ ______ ______ makes the ocean such a great place to live?

A. There’re about 5 million species in the ocean and we have yet to learn much about them.

B.There’re about 5 million species in the ocean, about ______ ______ ______ much waiting for us to learn.

The squid lives ______ the dark ______ a great depth ______ the bottom of the ocean.

The Yellow River winds its way ______ west ______ east and at last it flows ______ the sea.

Most ______ the Chinese people feed ______ rice.

The professor talked ______ two hours ______ stopping ______ a time.

_____ holding your breath, you can stay under water ______ about one minute.

—Is the house ______ the end ______ the street still______ sale?

—No, it has been sold.

Having been translated ______ many languages, his book soon became well known ______ the world.