HELP PLEASE I DONT UNDERSTAND SPANISH

Is anyone able to ? i am so confused. this sheet is about irregular preterit verbs and direct object pronouns in spanish.

Asubstance is made up of slow-moving particles that have very little space between them. based on this information, whatcan most likely be concluded about this substance? it is not a gas because its particles do not move continuously. it is a gas because its particles move continuously in a straight line. it is not a gas because its particles do not have large spaces between them. it is a gas because its particles move in many different directions.

Uerido diario: ayer mi hermana y yo (1) (ir) a la playa. cuando llegamos, (2) (ser) un día despejado con mucho sol, y nosotras (3) (estar) muy contentas. a las doce (4) (comer) unos sándwiches de almuerzo. los sándwiches (5) (ser) de jamón y queso. luego (6) (descansar) y entonces(7) (nadar) en el mar. mientras (8) (nadar), (9) (ver) a las personas que (10) (practicar) el esquí acuático. (11) (parecer) muy divertido, así que (12) (decidir) probarlo. mi hermana (13) (ir) primero, mientras yo la (14) (mirar). luego (15) (ser) mi turno. las dos (16) (divertirse) mucho esa tarde.