I’m afraid that Rare Earth(稀土) will if we continue to waste it．

The growing speed of a plant is influenced by a number of factors, ________ are beyond our control.

How do you think of Steve Jobs whosucceeded in creating the empire of Apple—I think the most important is that hehad intelligence ______the ordinary.

Someone is knocking at the door. – It ______ be Tom. He is still in the school.

________ that Tom got inside the room to see what wasgoing on.