Article and adjective together, getting dressed and celebrating.
Fill in the whole article — der, dem, einen, meiner … — as well as the adjective ending. Each article gap shows its base word in grey; the noun's gender is given.
Wer oder was? The subject — and after sein, werden, bleiben.
Wen oder was? The direct object — and after für, ohne, durch, gegen, um.
Wem? After mit, bei, nach, von, zu, aus, seit — and verbs like helfen, danken, gehören. Plural nouns add -n.
Wessen? Possession, and after wegen, trotz, während. Masculine and neuter nouns add -s or -es.
No case given here. Work out from the sentence which case each noun is in — the verb, the preposition, wo? or wohin? — then the ending.