To rearrange the sentences according to the pictures and complete the story, we would organize them as follows:

1. **b**. One day, Jack and his parents (travel) together.
2. **a**. The sights on the way (be) wonderful.
3. **c**. While his dad (try) to fix the car, Jack and Mom (feel) worried because it was getting dark.
4. **d**. Suddenly, while his dad (drive), the car (stop) working.
5. **e**. Luckily, a farmer (drive) by and (give) them a lift on his mini truck.
6. **f**. The family (feel) relieved.

Now, changing the verbs in brackets:

1. One day, Jack and his parents **traveled** together.
2. The sights on the way **were** wonderful.
3. While his dad **was trying** to fix the car, Jack and Mom **felt** worried because it was getting dark.
4. Suddenly, while his dad **was driving**, the car **stopped** working.
5. Luckily, a farmer **drove** by and **gave** them a lift on his mini truck.
6. The family **felt** relieved.

So the completed story reads:

One day, Jack and his parents traveled together. The sights on the way were wonderful. While his dad was trying to fix the car, Jack and Mom felt worried because it was getting dark. Suddenly, while his dad was driving, the car stopped working. Luckily, a farmer drove by and gave them a lift on his mini truck. The family felt relieved.