Hay sillas delante de los ordenadores.
Guapo means “good looking”. Going in order from left to right, their translations are pretty, serious, fun, ugly. Ugly is the opposite of good looking so feo is the answer.
To make a word in Spanish plural, it's quite similar to English where you will add s, es, etc to the end to indicate there are multiple of something.
10 words for examples as requested: plumas, libros, camisetas, escritorios, lápices (plural of lápiz), manos, pollos, sombreros, camisas, pantallas.
If you want to say the (word), add el/la depending on the word's gender.
