Let's analyze each statement based on the text:
- The T-shirts were expensive. - False. The text says "The T-shirts weren't expensive."
- Bill was alone in the shopping center. - False. The text says "I was with my friend Mike there."
- Mike bought two T-shirts. - False. The text says Mike bought two items, but it is not mentioned he bought two T-shirts.
- Bill and Mike watched a comedy film. - True. The text says "There was a good comedy film in the cinema and then we bought tickets and watched the film."
- Bill was with his friend Mike in the shopping center. - True. The text says "I was with my friend Mike there" and "I was in a shopping center".
Therefore, the correct statements are:
- Bill and Mike watched a comedy film.
- Bill was with his friend Mike in the shopping center.