1. Both sentences are grammatically correct, but the phrase "two your friends" in option 3 might be considered less common or informal compared to options 1 and 2. The phrase "two friends of yours" is more commonly used when referring to the friends belonging to someone.
2. Both options 4 and 5 are correct, but there is a slight difference in their usage. "I'm in the first year" simply states the current year of study, while "I'm in my first year" emphasizes that it is the first year of your academic journey.
3. Both options 6 and 7 are correct, and they can be used interchangeably. However, "What club are you in?" is a more common phrasing. It is more frequently used when asking about someone's current club membership.
Overall, the more popular phrasings from 6 through 7 would typically be "What club are you in?" and "I belong to the Sports club." However, the other options are also grammatically correct and understandable.