PLEASE HELP! I'LL GIVE BRAINLIEST IF CORRECT

Choose the best spanish equivalent to the phrase. you have to be ninth. tienes que ser el noventa. tienes que ser el noven. tienes que ser el noveno. tienes que ser la noventa.

Choose the best word to complete raúl's description of his school schedule. mi materia es el taller mecánico porque me gustan los carros preferida tarde después primero

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?