1.It is a famous g空格 who sing many popular songs.

1.It is a famous g空格 who sing many popular songs.
2.We must c空格 our attention while sutdying.
3.A lot of young sutdents are fond of c空格 gums.
4She felt a s空格 pain in her arm.
5.It is such a s空格 problem that it is beyond our ability to solve.
6.The old woman stood at the street corner looking rather w空格

1．It is a famous gang who sing many popular songs.
2．We must center our attention while studying.
3．A lot of young students are fond of chewing gums.
4．She felt a sudden pain in her arm.
5．It is such a serious problem that it is beyond our ability to solve.
6．The old woman stood at the street corner looking rather weak.
第一个应是复数名词,因为“who sing”表明不是第三人称单数.其他不赘述.