阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出能填入相应空白处的最佳选项。 As I remember, when I was a child, summers always had a great impression on me. In summer I was always free (41) school, and we were always (42) holiday at a quiet place. I enjoyed (43) in the hills. We usually stayed at a small country house. We had a rest for weeks, and I could do (44) I liked for most of the time. (45) four of my friends and I went on a holiday. We started early in the morning and we wanted to get to (46) small village. The sun was shining hot and the road seemed too long. One of my friends said that he knew a shorter way (47) the forest. We all agreed (48) go through the unknown forest. We had a very good walk there. We walked in the forest. We heard the birds (49) and we saw small animals. I will always remember childhood memories (50) this.

A. that
B. what
C. how