Ⅰ.语法填空
(2016·山西省考前质检)As a man was passing some elephants, he suddenly stopped, confused by the fact that these huge creatures were being held by only a small rope __1__ (tie) to their front leg. No chains, no cages. __2__was obvious that the elephants could, at any time, break __3__from their bonds but for some reason, they did not.
He saw a trainer nearby and asked why these animals just stood there and made no attempt __4__ (get) away. “Well,”__5__ trainer said, “when they are very young and much __6__ (small), we use the same size rope to tie them and, at that age, it's enough to hold them. As they grow up, they are conditioned to believe the rope __7__ still hold them, so they never try to run free.”