that we can’t get the necessary equipment , we will have to give up the experiment.

He, an average citizen, always thinks of_____ he can do more for the people．

The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

The teacher finds that Jane is quite different from ______ she was like one year ago.

——Your friend Alice looks down today. What is up?
——Well, ________ happened to her was her own fault!

There is a new problem involved in the popularity of private cars________road conditions need________.

While traveling in Sichuan，you can’t miss________people call “The National Treasure”—Giant Panda.  

—You see，I’m poor in maths，you are not good at English，and...
—That’s________we should help each other.

The woman was about to open the door ____________ she heard a strange sound from inside.

Though he is busy, music has always been _______ his work.