题目内容：

 

1.把我们的失败归罪在他头上是没用的。

It's no use______________  our defeat ______________ him.

2.二氧化碳由碳和氧组成。

Carbon dioxide ______________  _________ carbon and oxygen.

3.如果想赶上别人，就全神贯注于学习。

______________  _________  your study if you want to catch up with others。

4.他不仅写歌词而且谱曲。

Not only ______________ he _________ the words to the song, but also he composes the music.

5.任何教师都不能允许考试作弊。

No teacher can ______________  _________ cheating in exams.