p.1 TRIAL 1 エクササイズ(1) ① A boy is walking between his parents.② A boy is walking beside his father.③ A boy is walking behind his parents.④ A boy is walking next to his mother. (2)① A boy is climbing up the mountain.② A boy is helping the woman to climb up the rock wall.③ A woman is supporting the boy who is climbing up the wall. ④ A woman is watching the boy from a distance.