Всем здравствуйте !!!!!!!
Помогите пожалуйста. Нужно выбрать одно из двух ))

Задание.
9. She was reading the book (buying, bought) day before. 
10. Yesterday we were at a conference (organizing, organized) by the pupils of the 10th form.
11. (Taking, taken) the girl by the hand, she led her across the street. 
12. It was not easy to find the (losing, lost) stamp,
13. I shall show you a picture (painting, painted) by Hogarth. 
14. Here is the letter (receiving, received) by me yesterday. 
15. Do you know the girl (playing, played) in the garden? 
16. The book (writing, written) by this scientist is very interesting. 
17. Translate the words (writing, written) on the blackboard. 
18. We could not see the sun (covering, covered) by dark clouds.