What's the difference between the spanish infinitives (to be) ser and estar?

Choose the best word or phrase to complete the sentence.saben a. la tienda nuevab. al vendedorc. al gerente de la tiendad. mi nombre

In your own life, what are the most important benefits of studying spanish? in other words, why are you studying it? write your response in english.

(05.02 mc)  read the sentences. choose the option with the correct pronoun that would replace the part in  boldand the missing pronoun in the last sentence.soy gustavo  y tengo el pelo gris y uso lentes. señora lourdes, es canosa también.