Un día de primavera, antonio y alicia (viajar) por el campo. question 2 with 1 blank (hacer) mucho sol. question 3 with 1 blank el cielo (estar) azul. question 4 with 1 blank todo se (ver) muy bonito. question 5 with 1 blank de repente, ellos (oír) una explosión. question 6 with 1 blank el auto (empezar) a temblar (to shake). question 7 with 1 blank antonio (parar) el auto. question 8 with 1 blank antonio y alicia

1. Un día de primavera, Antonio y Alicia viajaban por el campo.  

2. hacía mucho sol.  

3. El cielo estaba azul.  

4. Todo se veía muy bonito.  

5. De repente, ellos oyeron una explosión.  

6. El auto empezó a temblar (to shake).  

7. Antonio paro el auto.  

8. Antonio y Alicia se bajaron

9. Querían saber qué pasó.  

10.  Inmediatamente, ellos  vieron que se había pinchado una llanta (that a tire had gone flat).

Explanation:

Here we have to write the correct form of the Imperfect Tense or the simple past tense of the verb in the blanks (according to the context).

In this sene, the Imperfect Tense (Preterite) in spanish is used to:

- talk about past habitual actions (adding used to in its different forms)

- describe what someone was doing when it was interrupted by someone (or something) else. In fact, is more a combination of the past tense and a continuous or repeating aspect. Frequently, this includes a sense of incompletion in the verb, but not always. (Is the equivalent to the Past Progresive Tense in english)

In other words:

It is specially used to describe what used to happen or what was happening.

So, in this text,  we are talking about two persons (Antonio and Aicia) that were driving through the countryside. This was an action that was taking place at that time in the past:

1. Un día de primavera, Antonio y Alicia viajaban por el campo.

The imperfect tense of the spanish verb viajar (to travel) with the 3rd person in plural ellos (they) is viajaban.

2. hacía mucho sol.  

The imperfect tense of the spanish verb hacer with the 3rd person in singular is hacía.

3. El cielo estaba azul.  

The imperfect tense of the spanish verb estar (to be) with the 3rd person in singular is estaba.

4. Todo se veía muy bonito.  

The imperfect tense of the spanish verb ver (to see) with the 3rd person in singular is veía.

5. De repente, ellos oyeron una explosión.  

The Past tense of the spanish verb oir (to listen) with the 3rd person in plural is oyeron.

6. El auto empezó a temblar (to shake).  

The past tense of the spanish verb empezar (to begin) with the 3rd person in singular i s empezó.

7. Antonio paró el auto.  

The past tense of the spanish verb parar (to stop) with the 3rd person in singular i s paró.

8. Antonio y Alicia se bajaron  (o bajaron)

The past tense of the spanish verb bajar (to get out) with the 3rd person in plural i s bajaron.

9. Querían saber qué pasó.  

The imperfect tense of the spanish verb querer (to want) with the 3rd person in plural is querían.

10.  Inmediatamente, ellos  vieron que se había pinchado una llanta (that a tire had gone flat).

The past tense of the spanish verb ver (to see) with the 3rd person in plural i s vieron.

well, i am responding 3 minutes into you posting. i assume 3 minutes?