第20题填__________ (二)根据短文内容，回答问问题。
Bad Eyesight
A young man was called up for army service，but he didn’t want to become a soldier．When he
went for his medical exam，__16__
The doctor pointed to the eye chart on the wall and said．“__17__”
“The doctor line of what?”the young man asked．
“__18__”the doctor replied．
“What chart? ”the man asked．“__19__”the doctor said．
“What wall?’’the mall said．
Finally,the doctor decided that the man’s eyes were not good enough for army service．
That evening the same young man was at a movie when another man came in and sat next to him in the dark．When the light went out．the young man saw that his neighbor who had examined him earlier．
Immediately he said，“Excuse，Madam，__20__”
第16题请填写__________.