What is the formal word for what in French?

Any french speakers? could someone check if my grammar is correct? my text: ma visite au zoo se passe bien. c’est très intéressant. ii y a les ours, les éléphants, les lions, les singes, les tigres, et les canards. les ours dorment. les singes sauter beaucoup. les tigres courent vite. les marchent canards.what i was it to say in english: my visit to the zoo is going good. it is very interesting. there are bears, elephants, lions, monkeys, tigers, and ducks. the bears sleep. the monkeys jump a lot. the tigers run fast. the ducks walk.

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.

Choose the best translation of the following sentence. they went to bed at 8: 00pm. ils se sont couchés à 20h00. il se sont couché à 20h00. ils s'ont couchés à 20h00. ils s'ont couché à 20h00.