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Open the brackets using the right form of the verb in the Passive Voice: 
1. Six public holidays (to celebrate) in Great Britain.2. Song festivals (to hold) in Wales every year. 3. His next birthday (to mark) at a restaurant. 4. Many social customs (to connect) with the celebration of Christmas in Great Britain. 5. A big Christmas tree (to put up) in Trafalgar Square a week ago. 6. The Christmas tree (to decorate) brightly by children tonight. 7. On Boxing Day* children and other members of families (to give) presents. 8. An exciting lecture on British 
history (to give) in our club. 9. The First of May (to celebrate) as the holiday for Labour in 1889 first. 10. Easter Peace Marches always (to organize) in many European countries. 11. He (to elect) President 3 years ago. 12. London (to divide) into two parts by the river Thames. 13. The financial and busi ness part of London (to call) "the City." 14. A very beautiful folk song (to sing) when I came into the hall. 15. He (to award) the first prize for his poems.