Question 6 with 2 blanks (llover) cuando ellos (salir) a la calle. question 7 with 2 blankscuando (yo) (llegar) a la tienda ya (estar) cerrada. question 8 with 2 blanksde repente (yo) (acordarse) de que (yo) (tener) deberes. question 9 with 2 blanksnormalmente yo (limpiar) mientras mi madre (cocinar). question 10 with 2 blankscuando andrea (correr) por el parque los fines de semana, siempre (ella) (ver) a mis amigos.

Llovía cuando ellos salieron. (It was raining when they got out.)

Llovía - imperfect tense because it describes the past situation

Salieron - past simple tense because it is a finished action in the past

Cuando llegué a la tienda ya estaba cerrada. (When I came the shop was already closed.)

Estaba - imperfect tense because it describes the past situation

Llegué - past simple tense because it is a finished action in the past

De repende me acordé de que tenía deberes. (I remembered that I had homework to do.)

Tenía - imperfect tense because it describes the past situation

Me acordé -  past simple tense because it is a finished action in the past

Normalmente yo limpiaba mientras mi madre cocinaba. (Usually, I used to clean while my madre used to cook.)

Limpiaba, cocinaba - imperfect tense because these are two habits repetead regularly in the past (normalmente = usually)

(Normalmente yo limpio mientras mi madre cocina. - we could use the present tense in this case too)

Cuando Andrea corría por el parque los fines de semana, siempre veía a mis amigos. (When Andrea used to run in the park on weekends, she always used to see my friends.)

Corría, veía - mperfect tense because these are two habits repetead regularly in the past (siempre = always)

(Cuando Andrea corre por el parque los fines de semana, siempre ve a mis amigos. - we could use the present tense in this case too)