①而不是        

②翻譯該句：當(dāng)我們離開(kāi)房間時(shí)，關(guān)掉燈和電腦是重要的。

①做……很重要        

②翻譯該句：我們最好多節(jié)約水、紙張和電。

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.