Прочитаем текст и дополним предложение.
В тексте находим: Bolster was so big that with one step he could travel six miles from hilltop to hilltop!
Заполним пропуск.
1 Because he was so big, Bolster could travel six miles from hilltop to hilltop.
Ответ: travel six miles from hilltop to hilltop