In Canada and the United States one of the most popular days in the year is Halloween

In Canada and the United States one of the most popular days in the year is Halloween. Halloween occcurs on October 31 st. It's a day when some people wear in strange or unusual costumes. For example, they may dress to look like an animal, a person from a book or movie or a famous person from history. After dark, many young children put on their costumes and visit their neighbors. They knock on the door and shout "Trick or treat". Then he neighbors give them some candy, and the children go on to the next house. Adults also enjoy dressing up for Halloween. There are usually Halloween parties in the evening and usually there is a prize for the best or most unusual costume. 

1. Is Halloween one of the most popular days in Canada and the USA?

2. When does Halloween happen?

3. What do young children do after dark?

4. Who also enjoy dressing up for halloween?

5. What are children given when they knock on their neighbors' door?