问题详情：
According to a news report, a certain private school in Washington was recently 71 (face) with 72 unique problem.
A number of 12-year-old girls were beginning to use lipsticks and would put it on in the bathroom. That was fine, but after they put on their lipsticks, they would press their lips to the mirror, 73 (leave) dozens of little lip prints.
Every night the maintenance man would remove the lip prints, and the next day the girls would put
74 (they) back.
Finally the principal decided that something had to be done. She called all the girls to the bathroom and met them there with the maintenance man. She 75 (explain) that all these lip prints were causing a major problem for the custodian(管理人) 76 had to clean the mirror every night.
77 (show) how difficult it had been to clean the mirrors, she asked the maintenance man to show the girls how much effort 78 (require).
He took out long-handled squeegee, dipped it in the toilet, and cleaned the mirror with it. Since then, there have been no lip prints 79 the mirror.
There are teachers... and then there are 80 (educate).
【回答】
71. faced 72. a 73. leaving 74. them 75. explained
76. who/that 77. To show 78. was required 79. on 80. Educators
知识点：语法填空
题型：未分类
