Here are the correct answers for each blank:

1. appeared
2. become
3. create
4. mixture
5. versions
6. chefs

So the text should read as follows:

"The Story of a Canadian Food

Poutine is a Canadian dish made of French fries topped with cheese. It first **appeared** in 1950s, rural Quebec and was widely popularized across Canada. It has **become** an iconic symbol of Québécois culture.

Poutine is believed to be invented by Jean-Paul Roy in 1964 when he was serving fries in a restaurant in 1958. When he noticed that customers were adding cheese curds to their fries, he tried adding the dish to his daily menu as well and then successfully **created** poutine. It is actually a **mixture** of various foods but fries and cheese are the most common ingredients.

After the dish became popular, it arrived in Quebec City in 1969 and in Montreal in 1983. As a popular street food, poutine became a common offering among people in Quebec and Ontario. As poutine's popularity spread, other **versions** began to appear, such as Italian poutine, veggie poutine and Irish poutine. By the 1990s the dish crossed the border and made the headlines for the New York or New Jersey, and was made with Italian mozzarella instead of traditional cheddar cheese.

While poutine is not an ideal choice for formal parties, it is still widely loved by most everyone. From time to time, some **chefs** began creating high-end versions of the dish to serve in high-end restaurants and poutine began to appear on menus at high-end restaurants in other cities such as Toronto, where lobster poutine was considered as a best-seller."