In such country would you call a bus an ómnibus a. cuba b. argentina c. spain d. dominican republic

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?

Llena el espacio con la forma del verbo que se escribe correctamente. ¿quién estas tortillas ricas?

Completa la oración con la voz pasiva con se. the cake was eaten. la torta. (there's no options, just phrase this in the passive tense, do not use google translate)