1. Aggressive: This is because it is an accusatory statement. The speaker is accusing someone else of always having to do what they would like to do instead of what the speaker would like to do. They are immediately accusing someone of being selfish by asking the question in this way.
2. Assertive: You can tell this is assertive due to the fact that the speaker began the sentence with the phrase "I would prefer". They are not ordering anyone to go to the movies tonight and stay in the next night. They are simply telling someone what they would prefer to do, not demanding anyone to do it.
3. Assertive: These two sentences coupled together are assertive because the speaker is simply asking if someone has seen their keys. The assertiveness comes from the fact that they think they left their keys at that location yesterday. They are guessing that that is the most recent place they left their keys. They begin with the question of someone having seen their keys, rather than accusing someone of not being able to find the speaker's keys. A more aggressive approach could be "I know I left my keys here yesterday! Why haven't you seen them?" Similar to the first sentence, this is accusatory and therefore aggressive.
Hope this helps!