Ser and estar help asap pls

What was the important event between the united states and cuba in 1991? a.assigned clinics b.greater number of tourists c.seizure d.increased import and export flow

Can you me conjugate this sentence of doubt using the subjunctive mood? “mis padres dudan que yo (hacer) toda mi tarea cada noche.”

Mi hermano espera que el tren a tiempo. a. llegas b. llega c. llegue d. llegues