Read the passage carefully and choose the word (A, B, C or D) that best fits each of the blank spaces.

We got up early in the morning. We carefully prepared our food boxes to take with us. We left the house and had to drive (1) _____ through the town traffic. However (2) _____ the countryside we drove fast. After an hour we reached the foot of the mountain. We (3) _____ the first part easily, but when we were nearly at the top we naturally slowed down (4) _____ it was difficult. We tried to reach the top and when we did, Dad said we had done well.

 We left the house and had to drive (1) _____ through the town traffic.