六. 短文改错（10分）
They were marching towards a building then 81._____________
they suddenly realized what the officer hadn’t left 82. _____________
him enough time to give the order to turn round 83. _____________
and to stop. So they went on marching straight 84. _____________
into the wall. The soldiers smiled happy as each of 85. _____________
those in the front line decide at the same time to walk 86. _____________
ahead. There was loud noise as they hit the wall 87. _____________
one after another. But before any of them had 88. _____________
no time to smile again, the officer shouted, “If you 89. _____________
have been in a really straight line, I could have heard 90. _____________
only one sound when you hit the wall!”
