修改病句（英語代詞方面）

題目：

修改病句（英語代詞方面）
1,Someone is knocking at the door,let's see who he is?
2,That is difficult for them to finish the project on time.
3,None knows what to do next
4,Neither of parents enjoy music
5,I have two books,all of them are new
I

解答：

1 he---it
2 That---It
3 None----No one
4 enjoy----enjoys
5 all----both