Which of the following sentences needs the personal a in the bank?

An acorn seed becomes a seedling before it is an oak tree. this is an example of which characteristics of life?

Debo decidir qué carrera quiero estudiar. a. después de b. antes de c. para comenzar d. temprano

Choose the phrase that best completes this sentence. hay muchas nubes en el cielo. el pronóstico dice que llover. a. vas a b. va a c. voy a d. vamos a