Is this correct? It’s for a quiz

Choose the best translation of the following sentence.i know what is happening.je sais que arrive.je sais ce que arrive.je sais qui arrive.je sais ce qui arrive.

Select what you would need to wear according to the weather: it is snowing. ils ont besoin d'un tee-shirt. ils ont besoin de chaussons. ils ont besoin de gants. ils ont besoin de lunettes de soleil.

Describe your favorite holiday. why is it your favorite? when is it? what traditions do you have to celebrate that holiday? be sure you use at least 5 complete french sentences in your response.