①而不是        

②翻译该句：当我们离开房间时，关掉灯和电脑是重要的。

①做……很重要        

②翻译该句：我们最好多节约水、纸张和电。

①最好做某事        

8. It is      (possible) to live on the moon now.

7. The little girl can read so many words. That's really        (usual) .

6. In many countries,it is      (polite) to point at others with your finger.

5. Some people think the computer is the most important        (invent) .

4. We all know the        (important) of study.