【小题1】把我们的失败归罪在他头上是没用的。
It's no use______________ our defeat ______________ him.
【小题2】二氧化碳由碳和氧组成。
Carbon dioxide ______________ _________ carbon and oxygen.
【小题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。
【小题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.
【小题5】任何教师都不能允许考试作弊。
No teacher can ______________ _________ cheating in exams.
竖直上抛一物体，经t秒钟后物体落回手中。已知星球半径为R，那么使物体不再落回星球表面，物体抛出时的速度至少为
