题目

11．The houses across the street are ________________(成为废墟), but they were in good condition a few years ago. 12．If you are at home and you smell gas, open the windows and get out of the building ________________ (立刻)． 13．She has gone to the library to ________________(寻找) a few facts and figures for the report during the past weeks. 14．The teacher ________________(认为……无关紧要) the matter because he considered it a small potato. 15．The whole high school ________________(对……感到震惊)  the news of the two students who killed themselves.13．一块正方形菜地的边长是8.7米．它的面积是多少平方米？