Problem: Erica Roe, Michael O'Brien and Mark Roberts are all famous for doing what at sports venues?
Answer: streaking

Problem: Which confectionery product completes the title of the Anthony Horowitz book 'The Falcon's ...........'?
Answer: malteser

Problem: Who was the writer of the novels 'Sad Cypress', 'N or M' and 'Sparkling Cyanide'?
Answer: agatha christie

Problem: How many players are on the field in a hockey team?
Answer:
eleven