Viết lại câu sao cho nghĩa không đổi

21. There are a number of factors . We have no control over them .

22. The picture was beautiful . She was looking at it .

23. That’s the woman . John used to be married to her .

24*. My sister has 2 daughters . I often have to look after them .

25*. This is the book . I’m looking for it.

26. The boy fell in love with the girl . She left him after a few weeks .