Question

используя 1-ое или 2-ое причастие 
1.translate the words (to write) on the blackboard
2.the (to loose) book was found at last
3.(to go) along the street i met Mary and Ann
4.i think that the boy (to stand) there is his brother
5.the book (to write) by him is very interesting

Answer 1

1. written
2. lost (а глагол - to lose, а не to loose)
3. going
4. standing
5. written

Answer 2

1.translate the words written on the blackboard
2.the lost book was found at last
3.going along the street i met Mary and Ann
4.i think that the boy standing there is his brother
5.the book written by him is very interesting